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Journal articles on the topic 'Akodon'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 January 2023

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1

Vilela, Julio Fernando, Paulo Sérgio D'Andrea, and Cibele Rodrigues Bonvicino. "The role of cytogenetic variation in Akodon cursor species complex speciation (Rodentia: Sigmodontinae)." Heringeriana 14, no. 1 (August 6, 2020): 1–12. http://dx.doi.org/10.17648/heringeriana.v14i1.917766.

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Chromosome polymorphism in populations of Akodon cursor complex (124 specimens) and the karyotypes of other Akodon species (92 specimens) from Brazil were analyzed. Five species were analyzed: Akodon cursor with 2n = 14, and Akodon aff. cursor with 2n = 16, Akodon montensis with 2n = 24, Akodon paranaensis with 2n = 44 and Akodon serrensis with 2n = 46. Chromosome polymorphism was observed in A. cursor and A. aff. cursor showing pericentric inversions, and also in A. paranaensis and A. montensis presenting supernumerary chromosomes. Pericentric inversion polymorphism affecting two autosomes pairs in A. cursor karyotype was found in Hardy-Weinberg equilibrium. Akodon with 2n = 16 occurred from Bahia to Rio Grande do Norte states and A. cursor with 2n = 14 from Bahia to Paraná states. Molecular analyses showed high genetic distance estimates between such set of samples, suggesting that karyomorphic type 2n = 16 is fixed in the northern part of the distribution of Akodon cursor complex. Captive hybrids males between Akodon [2n = 14] x [2n = 16] are apparently sterile, suggesting these populations may represent two full species.

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Silveira, Fabiana, Ives José Sbalqueiro, and Emygdio Leite de Araujo Monteiro-Filho. "Identificação das espécies brasileiras de Akodon (Rodentia: Cricetidae: Sigmodontinae) através da microestrutura dos pelos." Biota Neotropica 13, no. 1 (March 2013): 339–45. http://dx.doi.org/10.1590/s1676-06032013000100033.

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No Brasil há 10 espécies de Akodon Meyen, 1833 e a maioria apresenta algum grau de sobreposição geográfica havendo inclusive registros de simpatia. A identificação das espécies é difícil e pode ser feita pela análise da estrutura morfológica de pelos. Assim, para a identificação da microestrutura de pelos de nove espécies brasileiras de Akodon, foram utilizados pelos-guardas primários de amostras de coleções zoológicas. Foi adotado o método de análise das escamas cuticulares e da medula. O padrão de cutícula para todas as espécies foi folidáceo estreito. Já para a medula foram reconhecidos três padrões básicos como multisseriada alveolar, multisseriada listrada e misto de alveolar e listrada. Akodon cursor é a única espécie com predomínio de quatro fileiras sendo que exemplares 2n = 14 e 2n = 15 apresentam medula alveolar e o 2n = 16, medula listrada e células longilíneas. Para Akodon paranaensis e A. lindberghi a medula se alterna entre três e quatro fileiras. As demais espécies apresentam três fileiras. Akodon mystax apresenta um maior espaçamento entre as células. Akodon reigi possui o setor intermediário com fileiras ovaladas e bem ligadas e Akodon toba tem as células da fileira central variando com uma e duas células alveolares pequenas. No padrão listrado, Akodon montensis apresenta espaço intercelular mais estreito em relação à espessura da célula. No padrão misto, Akodon azarae apresenta células com contorno evidente, já Akodon serrensis as células apresentam formato irregular. Assim, o uso da microestrutura dos pelos como ferramenta para a identificação das espécies de Akodon mostrou-se perfeitamente viável.

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3

Ruelas, Dennisse, Víctor Pacheco, and Carlos F. Jiménez. "Range extension and phylogenetic relationships of Akodon josemariarguedasi (Rodentia: Cricetidae) with comments on the aerosus species group." Mammalia 84, no. 2 (March 26, 2020): 207–13. http://dx.doi.org/10.1515/mammalia-2018-0209.

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AbstractThe José María Arguedas’ grass mouse, Akodon josemariarguedasi, is currently known from the central Yungas of Peru, ranging from the right (south) side of the Río Huallaga in Huánuco Department (in the north) to Junín Department (in the south); its phylogenetic affinities are unknown. We collected four specimens from Quintao, Tayacaja, Huancavelica Department allocated to this species, extending the species range 144 km farther south from its previous known distribution; and inferred the phylogenetic relationships of this species within the aerosus species group based on molecular analyses of the mitochondrial cytochrome b gene. We confirm that A. josemariarguedasi is a member of the aerosus species group and it is a sister taxon to Akodon mollis “Ancash” and then to Akodon torques. Also, we found that Akodon kotosh is closely related to Akodon orophilus, and not A. josemariarguedasi. Finally, we confirm that Akodon budini and Akodon siberiae are also members of the aerosus species group.

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D’ELÍA, GUILLERMO, J. PABLO JAYAT, PABLO E. ORTIZ, JORGE SALAZAR-BRAVO, and ULYSES F. J. PARDIÑAS. "Akodon polopi Jayat et al., 2010 is a senior subjective synomym of Akodon viridescens Braun et al., 2010." Zootaxa 2744, no. 1 (January 19, 2011): 62. http://dx.doi.org/10.11646/zootaxa.2744.1.5.

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Two new taxa of species level were recently named for grass mice of the genus Akodon (Cricetidae, Sigmodontinae) from central Argentina: Akodon polopi Jayat, Ortiz, Salazar-Bravo, Pardiñas et D’Elía, 2010 and Akodon viridescens Braun, Mares, Coyner et Van Den Bussche, 2010. Several lines of evidence show that both taxa refer to the same biological species.

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5

BRANDÃO, MARCUS VINICIUS, ANA PAULA CARMIGNOTTO, ALEXANDRE REIS PERCEQUILLO, ALEXANDRE UARTH CHRISTOFF, ANA CRISTINA MENDES-OLIVEIRA, and LENA GEISE. "A new species of Akodon Meyen, 1833 (Rodentia: Cricetidae) from dry forests of the Amazonia-Cerrado transition." Zootaxa 5205, no. 5 (November 10, 2022): 401–35. http://dx.doi.org/10.11646/zootaxa.5205.5.1.

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Akodon is the most diverse genus of the tribe Akodontini, comprising 41 extant species. Although distributed in a wide range of environments in South America, the genus was long considered to be absent from Amazon Forest. Nonetheless, in recent decades, records of Akodon have been reported based on specimens from southern Amazonia, throughout the contact zone with Cerrado. Published data about the unique karyotype (2n=10), along with evidence of sister phylogenetic relationship (Cytb sequences) with Akodon cursor, a species from the Atlantic Forest, suggest that these specimens represent an undescribed species. Herein we hypothesize that these samples represent a new species of Akodon from Amazonia-Cerrado transitional areas. Through the analyses of 217 specimens from Mato Grosso and Pará states, Brazil, as well as 336 specimens of Akodon cursor species group from the Atlantic Forest, we provide qualitative and quantitative external and craniodental data that support their distinction in comparison with other congeners. The sister relationship between this new species and A. cursor provide additional evidence of a past connection between the two largest tropical forests of South America. Moreover, the recognition of Akodon n. sp. points to the presence of the genus in the Amazonia-Cerrado transition, an area currently under great anthropic pressure, highlighting the fact that we might be losing a portion of Brazilian biodiversity before even getting to know it.

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PARDIÑAS, ULYSES F. J., PABLO TETA, GUILLERMO D’ELÍA, and GABRIELA B. DIAZ. "Taxonomic status of Akodon oenos (Rodentia, Sigmodontinae), an obscure species from West Central Argentina." Zootaxa 2749, no. 1 (January 26, 2011): 47. http://dx.doi.org/10.11646/zootaxa.2749.1.4.

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Akodon oenos Braun, Mares, and Ojeda, 2000 was described on a large sample of individuals collected from two localities near Mendoza city, Argentina. This sample was obtained in the 1980’s by Julio R. Contreras and María I. Rossi and labeled, but never published, as “Akodon minoprioi new species.” The description provided by Braun and collaborators was limited to craniodental and color pelage traits compared with those of five individuals of the sympatric form A. molinae Contreras, 1968. Akodon oenos was proposed as new and presumptively allied to the A. varius species group of Akodon. In February 2009 we collected an individual of Akodon in Llancanelo Natural Reserve, southern Mendoza, that morphologically fits the original description of A. oenos. Further study of some individuals of the type series of A. oenos reinforces this taxonomic hypothesis for the Llancanelo specimen. However, comparisons with other Akodon species overlooked by Braun and collaborators, reveals striking similarities with the widespread and phenotypically variable species A. spegazzinii Thomas, 1897. The evidence at hand, including morphological, karyological, and genetical traits, allows us to propose a new taxonomic scenario. A. oenos is considered here a junior synonym of A. spegazzinii and therefore belongs to the A. boliviensis species group of Akodon, extending the known geographic distribution for this species at least to southern Mendoza piedmont in the ecotone between the Monte and Patagonia eco-regions. More generally, this situation highlights the necessity when working with complex genera (as many sigmodontines are) to perform extensive comparisons and to use several sets of evidence in order to reduce the probability of generating biologically redundant names and more taxonomic confusion.

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7

Geise, Lena. "Akodon cursor(Rodentia: Cricetidae)." Mammalian Species 44 (January 25, 2012): 33–43. http://dx.doi.org/10.1644/893.1.

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8

Pearson, Oliver P., and Margaret F. Smith. "Genetic similarity between Akodon olivaceus and Akodon xanthorhinus (Rodentia: Muridae) in Argentina." Journal of Zoology 247, no. 1 (January 1999): 43–52. http://dx.doi.org/10.1111/j.1469-7998.1999.tb00191.x.

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9

JAYAT, J. PABLO, PABLO E. ORTIZ, JORGE SALAZAR-BRAVO, ULYSES F. J. PARDIÑAS, and GUILLERMO D’ELÍA. "The Akodon boliviensis species group (Rodentia: Cricetidae: Sigmodontinae) in Argentina: species limits and distribution, with the description of a new entity." Zootaxa 2409, no. 1 (March 24, 2010): 1. http://dx.doi.org/10.11646/zootaxa.2409.1.1.

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Akodon, with about 42 living species, is the most diverse genus of the subfamily Sigmodontinae. The Akodon boliviensis species group includes small-bodied, morphologically similar forms inhabiting Altiplano grasslands and grassland/forest ecotones of the eastern slope of the Andes, from central Peru to central Argentina. Northwestern Argentina contains the largest diversity of species of the group; the taxonomic treatment of these species has been based largely on unsupported and some weakly based opinions as underscored by recurrent changes. Based on morphologic and molecular data we assessed species limits among Argentinean populations of the Akodon boliviensis species group. We conclude that four species of the A. boliviensis species group inhabit northwestern Argentina. These are: A. boliviensis; A. caenosus (under which we synonymyze A. aliquantulus); A. spegazzinii (of which the nominal forms alterus, leucolimnaeus, and tucumanensis are junior synonyms); and A. sylvanus. Additionally, we described here a new species of the A. boliviensis species group, Akodon polopi, which inhabits central Argentina. This is the only species of the A. boliviensis species group inhabiting the Sierras Grandes range (ca. 2000 m), mountain system of medium height, isolated (ca., 600 km) from the main Andean chain by low elevation arid and semiarid environments. Additionally, our phylogenetic analyses suggests that the Akodon varius species group is polyphyletic.

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10

Apfelbaum, Liliana I., and Antonio Blanco. "Genetic polymorphism in populations of Akodon rodents." Canadian Journal of Genetics and Cytology 27, no. 1 (February 1, 1985): 12–16. http://dx.doi.org/10.1139/g85-003.

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By means of starch gel electrophoresis, 16–20 loci coding for enzymes and hemoglobin have been investigated in six population samples of Akodon dolores, captured in a single site of the Córdoba province (Argentina) during a 3-year period and in three samples of an Akodon azarae population. Proportion of polymorphic loci (P) ranged from 0.278 to 0.389 in A. dolores and from 0.166 to 0.300 in A. azarae. Mean heterozygosity (H) ranged from 0.138 to 0.192 in A. dolores and from 0.099 to 0.118 in A. azarae. These values are very high compared with those reported for northern hemisphere rodent populations. The high value is remarkable since the loci sample is biased towards the less variable (group I) enzymes.Key words: polymorphism, Akodon, heterozygosity, isozymes.

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11

Astúa, Diego, Isabella Bandeira, and Lena Geise. "Cranial morphometric analyses of the cryptic rodent species Akodon cursor and Akodon montensis (Rodentia, Sigmodontinae)." Oecologia Australis 19, no. 01 (October 2015): 143–57. http://dx.doi.org/10.4257/oeco.2015.1901.09.

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12

Hernandez, Gabriel, Soraida Garcia, Júlio F. Vilela, and Noé U. de la Sancha. "Ontogenetic variation of an omnivorous generalist rodent: the case of the montane akodont (Akodon montensis)." Journal of Mammalogy 98, no. 6 (October 27, 2017): 1741–52. http://dx.doi.org/10.1093/jmammal/gyx135.

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13

Michel, Thais, Ugo Souza, Bruno DallAgnol, Anelise Webster, Felipe Peters, Alexandre Christoff, André Luza, et al. "Ixodes spp. (Acari: Ixodidae) ticks in Rio Grande do Sul state, Brazil." Systematic and Applied Acarology 22, no. 12 (November 24, 2017): 2057. http://dx.doi.org/10.11158/saa.22.12.3.

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Among the 251 described species of ticks from the genus Ixodes, only eight were previously reported in Brazil, Ixodes amarali, Ixodes aragaoi, Ixodes auritulus, Ixodes fuscipes, Ixodes loricatus, Ixodes luciae, Ixodes paranaensis and Ixodes schulzei. Of those species, I. loricatus is considered commonly found, whereas I. auritulus and I. aragaoi were registered just one time in Rio Grande do Sul (RS) state, Southern Brazil. This paper aims to update the Ixodes species occurring in RS through the investigation of the ixodofauna of small rodents. Data from 314 wild rodents were analyzed from nine municipalities of Pampa biome and five from the Atlantic Rainforest in RS. Rodents belonging to the following species were infested by Ixodes spp. ticks: Akodon azarae, Akodon montensis, Akodon paranaensis, Akodon reigi, Calomys laucha, Delomys dorsalis, Deltamys kempi, Holochilus brasiliensis, Oligoryzomys flavescens, Oligoryzomys nigripes, Oxymycterus nasutus, Scapteromys tumidus (Cricetidae) and Cavia aperea (Caviidae). The tick identification was performed based on morphological dichotomous keys, their updates and by molecular techniques. Considering the ticks from the rodents and those collected directly from the environment, 34 specimens of Ixodes spp. were collected. Our results improved to five the list of Ixodes species that occur in RS: I. loricatus, I. auritulus, I. aragaoi, I. fuscipes and I. longiscutatus. Moreover, the finding of I. longiscutatus increases to nine the number of Ixodes species in Brazil. The occurrence of two species of the Ixodes ricinus complex (I. aragaoi and I. fuscipes) highlights the potential impact of Ixodes spp. ticks on public health.

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Cardoso, Thiago dos Santos, Caryne Aparecida de Carvalho Braga, Carla Elizabeth Macabu, Raquel de Oliveira Simões, Sócrates Fraga da Costa-Neto, Arnaldo Maldonado Júnior, Rosana Gentile, and José Luis Luque. "Helminth metacommunity structure of wild rodents in a preserved area of the Atlantic Forest, Southeast Brazil." Revista Brasileira de Parasitologia Veterinária 27, no. 4 (November 8, 2018): 495–504. http://dx.doi.org/10.1590/s1984-296120180066.

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Abstract The helminth fauna and metacommunity structure of eight sympatric sigmodontine rodents were investigated at the Serra dos Órgãos National Park, an Atlantic Forest reserve located in the State of Rio de Janeiro, southeast Brazil. Rodents of the species Abrawayaomys ruschii, Akodon montensis, Blarinomys breviceps , Delomys dorsalis, Oligoryzomys flavescens, Oligoryzomys nigripes, Oxymycterus quaestor and Thaptomys nigrita were found infected with helminths. Akodon montensis presented the highest total helminth species richness, with six different species of helminths. The nematode Stilestrongylus lanfrediae was the most abundant and prevalent helminth species observed. The host-parasite network analysis showed little interactions among host species. Akodon montensis seems to act as a keystone-species in the rodent community. This species shared the nematodes Stilestrongylus aculeata with A. ruschii and Protospirura numidica criceticola with T. nigrita, and the cestode Rodentolepis akodontis with D. dorsalis. The congeners host species O. flavescens and O. nigripes shared the nematodes Guerrerostrongylus zetta and S. lanfrediae. The rodents B. breviceps and O. quaestor did not share any helminths with other hosts. The helminth metacommunity showed a random pattern on both infracommunity and component community levels, indicating different responses by each helminth species to the environmental gradient.

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Bochkov, Andre V. "To the systematics of the subgenus Hesperomyobia Bochkov, 1997 (Acariformes: Myobiidae: Radfordia)." Systematic and Applied Acarology 22, no. 6 (May 19, 2017): 785. http://dx.doi.org/10.11158/saa.22.6.4.

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A new myobiid mite species Radfordia (Hesperomyobia) akodon sp. nov. is described from Akodon varius Thomas (Rodentia: Cricetidae: Sigmodontinae) from Bolivia. This new species is known only from a female which differs from those of Radfordia (H.) sigmodontis Radford from Sigmodon hispidus Ray and Ord, and Radfordia (H.) sigmomys Bochkov and Fain from Sigmodon alstoni (Thomas) by the following features. In R. (H.) akodon sp. nov., setae vi are 50 μm long and 7 μm wide (vs. 10–12 μm long and 2 μm wide in R. sigmodontis, and 23–25 μm long and 2 μm wide in R. sigmomys), dorsal idiosomal setae si, se, c1, c2, d1, and d2 are 5–10 μm wide (vs. 2–3 μm wide in R. sigmodontis and R. sigmomys), and setae e1 are 2.6 times longer than f1 (vs. subequal in R. sigmodontis and R. sigmomys). In addition, Radfordia (Hesperomyobia) vandenberghi Fain and Lukoschus is newly recorded herein from Oligoryzomys flavescens (Waterhouse) and Oligoryzomys sp. (Rodentia: Cricetidae: Sigmodontinae) in Bolivia. It is suggested that this mite species is associated exclusively with hosts of the genus Oligoryzomys Bangs.

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Machado, Arielli F., Cristiane F. Marks, Brisa Peres, Geruza L. Melo, and Nilton C. Cáceres. "Movement and use of environmental structures, climbing supports and shelters by Akodon montensis (Sigmodontinae, Rodentia) in the Atlantic Forest of southern Brazil." Mammalia 84, no. 1 (December 18, 2019): 107–13. http://dx.doi.org/10.1515/mammalia-2018-0096.

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Abstract Movements under environmental structures and on supports, and the use of shelters by Akodon montensis were assessed using the spool-and-line technique. Movements of a few individuals of Thaptomys nigrita, Brucepattersonius iheringi and Oligoryzomys nigripes were also assessed and briefly described. Akodon montensis often used fallen logs, lianas and ferns as climbing supports for movements. The species moved under different environmental structures with differing frequencies, with greater use of dense litter followed by lianas and fallen branches. The studied sigmodontine species used shelters of different compositions and structures, and differed in displacement behavior. This study is the first to contribute to understanding the movement and use of environmental structures, shelters and climbing supports by A. montensis.

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Jayat, J. Pablo, Pablo E. Ortiz, Agustina A. Ojeda, Agustina Novillo, Pablo Teta, Guillermo D’Elía, and Ricardo A. Ojeda. "Quantitative morphological characters of the skull suggest that Akodon oenos (Rodentia, Cricetidae, Sigmodontinae) is not a junior synonym of A. spegazzinii." Mammalia 84, no. 3 (March 26, 2020): 299–313. http://dx.doi.org/10.1515/mammalia-2019-0043.

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AbstractAkodon oenos, a nominal form with type locality in northern Mendoza province, Argentina, has an intricate taxonomic history. Recently, it was considered a junior synonym of Akodon spegazzinii on the basis of morphological similarities of one individual captured in southern Mendoza with specimens belonging to the type series of A. oenos, plus the genetic similarity of that single specimen with representatives of A. spegazzinii. We compared specimens of the Akodon boliviensis species group recently captured in Mendoza with the type series of A. oenos and series of A. spegazzinii from northwestern Argentina. We conducted an analysis of molecular markers (cytochrome-b gene) and quantitative morphological studies (comparisons of skull measurements). Our results showed that: (1) all sequenced specimens of the A. boliviensis group from Mendoza form a monophyletic clade closely related to A. spegazzinii; (2) contrary to previous hypothesis, specimens of Akodon from Mendoza are morphologically distinctive in size and shape of the skull, from A. spegazzinii; and (3) within the A. boliviensis species group, specimens from Mendoza are distinctive. We argue that the synonymy of A. oenos under A. spegazzinii must await further studies, including molecular markers other than mitochondrial and samples of DNA sequences from topotypical specimens of A. oenos.

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Suárez, Olga V., María Busch, and Fernando O. Kravetz. "Reproductive strategies in Akodon azarae (Rodentia, Muridae)." Canadian Journal of Zoology 82, no. 10 (October 1, 2004): 1572–77. http://dx.doi.org/10.1139/z04-137.

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The balance between litter size and the quality of offspring is a central feature to many optimal litter-size theories. We analyzed the reproductive strategies of Akodon azarae (Fischer, 1829) females, according to maternal life histories and the time of birth. Litter size decreased significantly from spring to autumn. A significant birth–season effect on mass at birth was observed. A compensatory effect of growth rate was evident during lactation. During spring and early summer, over-wintered females produced an average of 5 young, with maximum survival at weaning (100%). Females born during the current reproductive season showed a smaller litter size, probably because they favor residual reproductive value with respect to current reproduction since they have a higher life expectancy and future chances of mating than over-wintered females. Mortality reached 50% at weaning for summer litters from young mothers, whereas it declined to 22.2% in autumn. Differences in both parental investment and offspring survival suggest that litter size in A. azarae varies along the reproductive period and is dependent both on females' life history and on environmental conditions.

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Liascovich, R. C., and O. A. Reig. "Low Chromosomal Number in Akodon cursor montensis Thomas, and Karyologic Confirmation of Akodon serrensis Thomas in Misiones, Argentina." Journal of Mammalogy 70, no. 2 (May 25, 1989): 391–95. http://dx.doi.org/10.2307/1381525.

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Wittouck, P., E. Pinna Senn, C. A. Soñez, M. C. Provensal, J. J. Polop, and J. A. Lisanti. "Chromosomal and Synaptonemal Complex Analysis of Robertsonian Polymorphisms in Akodon dolores and Akodon molinae (Rodentia, Cricetidae) and their Hybrids." CYTOLOGIA 60, no. 2 (1995): 93–102. http://dx.doi.org/10.1508/cytologia.60.93.

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21

D’Andrea, PS, R. Gentile, LS Maroja, FA Fernandes, R. Coura, and R. Cerqueira. "Small mammal populations of an agroecosystem in the Atlantic Forest domain, southeastern Brazil." Brazilian Journal of Biology 67, no. 1 (February 2007): 179–86. http://dx.doi.org/10.1590/s1519-69842007000100025.

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This study reports 2 years of the population dynamics and reproduction of a small mammal community using the removal method. The study was conducted in a rural area of the Atlantic Forest, in Sumidouro, Rio de Janeiro State, Brazil. The population sizes, age structure and reproduction were studied for the four most common species in the study area. The overall diversity was 1.67 and ranged between 0.8 to 1.67. The species richness was 13 considering the whole study. The most abundant species were the rodents Nectomys squamipes (n = 133), Akodon cursor (n = 74), Oligoryzomys nigripes (n = 25) and the marsupials Didelphis aurita (n = 58) and Philander frenatus (n = 50). Seven other rodents were captured once: Necromys lasiurus, Akodon montensis, Sooretamys angouya, Oecomys catherine, Oxymycterus judex, Euryzygomatomys spinosus and Trinomys iheringi. There were higher peaks for diversity and species richness during the winter (dry) months, probably due to higher food availability. The marsupials had a seasonal reproduction with highest population sizes at the end of the rainy seasons. Nectomys squamipes reproduced mostly during rainy periods. Akodon cursor reproduced predominantly in the winter with the highest population peaks occurring during this season. The analysis of the population dynamics of the rodent species indicated that no species behaved as an agricultural pest, probably due to the heterogeneous landscape of high rotativity of vegetable cultivation. Rodent populations were more susceptible to the removal procedure than marsupial ones.

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Fernández, Fernando J., Fabricio Idoeta, César García-Esponda, Joaquín D. Carrera, Germán J. Moreira, Fernando Ballejo, and Luciano J. M. De Santis. "Small mammals (Didelphimorphia, Rodentia and Chiroptera) from Pampean Region, Argentina." Check List 8, no. 1 (February 1, 2012): 130. http://dx.doi.org/10.15560/8.1.130.

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We studied small mammal assemblages recovered from owl pellets collected at 11 locations throughout the Argentina’s Pampean Region. We identified 21 species, including two marsupials, one bat, and 18 rodents. From the analysis of this dataset, we could distinguish three main groups of small mammals that currently inhabit the Pampean Region: 1) a group of taxa related to Pampean agroecosystems (Calomys spp., Akodon azarae, and Oligoryzomys flavescens); 2) a group of Brazilian species (Cavia aperea, Oxymycterus rufus, Necromys lasiurus, Necromys obscurus, Holochilus brasiliensis, and Monodelphis dimidiata); and 3) a group including species from Patagonia, Espinal and Monte phytogeographic provinces (Microcavia australis, Oligoryzomys longicaudatus, Eligmodontia typus, Graomys griseoflavus, and Akodon molinae). In addition, we documented the first record of a species of the large-bodied group of Calomys in Buenos Aires province, expanding its distribution ca. 420 km southward.

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Pardiñas, U. F. J., G. D'elía, and S. Cirignoli. "The genus Akodon (Muroidea: Sigmodontinae) in Misiones, Argentina." Mammalian Biology 68, no. 3 (2003): 129–43. http://dx.doi.org/10.1078/1616-5047-00075.

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Montoya-Bustamante, Sebastián, Natalya Zapata-Mesa, and Oscar E. Murillo-García. "Leucism in Akodon affinis (Allen, 1912) (Rodentia: Cricetidae)." Therya 8, no. 3 (September 30, 2017): 269–72. http://dx.doi.org/10.12933/therya-17-494.

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Almeida, Célio Rodrigues de, Alzira Maria Paiva Almeida, Darci Pascoal Brasil, José Dantas Sobrinho, and Miguel Archanjo Muniz Leal. "Estudo do roedor Akodon arviculoides, Wagner, 1842 (Cricetidae): importância nos focos pestosos no Brasil." Memórias do Instituto Oswaldo Cruz 81, no. 4 (December 1986): 409–16. http://dx.doi.org/10.1590/s0074-02761986000400008.

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Relata-se a ocorrência do roedor Akodon arviculoides (Wagner, 1842) no foco pestoso do Agreste pernambucano, sua capacidade de sobrevivência, reprodução e o desenvolvimento no cativeiro, a susceptibilidade à infecção pela Yersinia pestis e a importãncia desse roedor nos focos pestosos do Brasil.

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Schiaffini, Mauro I., Analía L. Giménez, and Gabriel M. Martin. "Didelphimorphia and Rodentia (Mammalia) from Sierras de Tecka and surrounding areas, northwestern Chubut, Argentina." Check List 7, no. 6 (December 1, 2011): 704. http://dx.doi.org/10.15560/11005.

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The small mammal fauna from northwestern Chubut Province (Argentina) is poorly known. We herein report small mammal assemblages from three new localities: Sierras de Tecka, an extra-Andean system elevated 900 m.a.sl.; Estancia La Mimosa on the Tecka river valley (at ca. 650 m.a.sl.); and Arroyo Pescado (at ca. 620 m.a.sl.) 40 km north of the other sites. Specimens were recovered from disaggregated owl pellets. Total species richness includes 16 native (13 sigmodontine and two caviomorph rodents, and one marsupial) and one introduced species. Estancia La Mimosa had the highest richness (n = 14), while Arroyo Pescado the lowest (n = 11). Four species were only recorded at Estancia La Mimosa (Akodon iniscatus, Calomys musculinus, Oligoryzomys longicaudatus and Mus musculus), two in Sierras de Tecka (Notiomys edwardsii and Microcavia australis) and one in Arroyo Pescado (Geoxus valdivianus). This work also adds new localities for Akodon iniscatus, Geoxus valdivianus, Lestodelphys halli and Notiomys edwardsii in western Chubut Province.

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Testoni, André F., Jaqueline Fumis, Sérgio L. Althoff, Fernando R. Tortato, and Jorge J. Cherem. "Akodon serrensis Thomas, 1902 (Mammalia: Rodentia: Sigmodontinae): records in Santa Catarina state, southern Brazil." Check List 8, no. 6 (December 1, 2012): 1344. http://dx.doi.org/10.15560/8.6.1344.

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We report Akodon serrensis Thomas, 1902 from three localities in the state of Santa Catarina, in southern Brazil. The specimens were identified based on cytogenetic and craniometric analyses. These are the first records of A. serrensis collected in Santa Catarina, which extend the range of this species ca. 330 km S.

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SALINAS, MARÍA L. SANDOVAL, JOSÉ D. SANDOVAL, and ELISA M. COLOMBO. "Objective measurement of Akodon budini dorsal coloration: methodological concerns." Anais da Academia Brasileira de Ciências 88, suppl 1 (April 29, 2016): 489–502. http://dx.doi.org/10.1590/0001-3765201620150004.

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ABSTRACT The role of color in taxonomic and systematic studies of several taxa is central. Color data are more valuable if they permit comparisons. We aimed to provide pelage objective color measurements of a series of Akodon budini and to use those color data to test and to quantitatively analyze the influence of both the lighting source and the measuring point, in the determination of pelage color of museum skins. We used a spectroradiometer to measure the pelage color at five points over the dorsal midline of 54 Akodon budini museum skins. PCAs and ANOVAs were conducted over the color data. The characteristics of the studied series also allowed us to include and assess the potential effects of some main sources of intra-specific variation. Determinations of fur color strongly depend on the lighting source, and therefore it is essential that lighting conditions are controlled during color measurements and then made explicit when communicating the color characterization of particular taxonomic units. Furthermore, color determinations strongly depend on the measuring point, even on the same body area, and therefore it is critical that the color characterization of a taxon includes the variation between different points of the different body parts of the studied specimens.

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Burgos, E. F., M. V. Vadell, C. M. Bellomo, V. P. Martinez, O. D. Salomon, and I. E. Gómez Villafañe. "First Evidence of Akodon-Borne Orthohantavirus in Northeastern Argentina." EcoHealth 18, no. 4 (November 1, 2021): 429–39. http://dx.doi.org/10.1007/s10393-021-01564-6.

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Piantanida, Martha, and Georgina E. Barrantes. "Growth studies in Akodon dolores (Rodentia: Muridae) in captivity." Acta Theriologica 43 (June 12, 1998): 185–93. http://dx.doi.org/10.4098/at.arch.98-14.

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Geise, L., F. C. Canavez, and H. N. Seuanez. "Comparative karyology in Akodon (Rodentia, Sigmodontinae) from southeastern Brazil." Journal of Heredity 89, no. 2 (March 1, 1998): 158–63. http://dx.doi.org/10.1093/jhered/89.2.158.

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Cherem, Jorge José, Patrícia Hadler, Narla Shannay Stutz, and Ulyses Francisco José Pardiñas. "Pequenos mamíferos (Didelphimorphia, Chiroptera e Rodentia) em egagropilos de Tyto furcata (coruja-das-igrejas) (Aves, Tytonidae) do sul do Brasil." Biotemas 31, no. 3 (September 17, 2018): 43–58. http://dx.doi.org/10.5007/2175-7925.2018v31n3p43.

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A análise e identificação de pequenos mamíferos em egagropilos de coruja, em especial do gênero Tyto, são consideradas uma ferramenta útil e complementar na mastozoologia. No entanto, poucos estudos deste tipo têm sido desenvolvidos no sul do Brasil. Foram analisados os fragmentos cranianos e mandibulares de pequenos mamíferos encontrados em egagropilos de Tyto furcata coletados em sete localidades dos três estados do sul do país. Ao todo, foram contabilizados 2.382 indivíduos pertencentes a 29 táxons, incluindo cinco marsupiais (Didelphidae; 1,39% dos indivíduos), quatro quirópteros (Molossidae, Phyllostomidae e Vespertilionidae; 0,25%) e 20 roedores (Cricetidae, Muridae, Caviidae e Echimyidae; 98,36%). Os roedores Akodon spp., Oligoryzomys sp. e Mus musculus foram os táxons mais comuns. A amostra inclui espécies com poucos registros para o sul do Brasil, como Bibimys sp., Calomys tener e Wilfredomys oenax. A riqueza de pequenos mamíferos obtida nessas amostras corrobora a utilidade e importância da análise de egagropilos de aves de rapina. Ainda assim, são necessários estudos mais detalhados sobre a morfologia e identificação das espécies, como de Akodon e Oligoryzomys, considerando-se a natureza fragmentária do material nos egagropilos.

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Skupien, Fabrício Luiz, Daniele Pereira Rodrigues, Jady de Oliveira Sausen, Gislene Lopes Gonçalves, and Daniela Oliveira de Lima. "Small mammals and microhabitat selection in forest fragments in the transition zone between Atlantic Forest and Pampa biome." Papéis Avulsos de Zoologia 62 (August 2, 2022): e202262039. http://dx.doi.org/10.11606/1807-0205/2022.62.039.

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Natural resources are depleted in fragmented landscapes that have their vegetation also altered. As a result, the microhabitat diversity and the composition and distribution of local species are affected. In this study, we evaluated the small mammals' community diversity, composition and microhabitat selection in two Atlantic Forest fragments, in an ecotone area with the Pampa biome, southern Brazil. We recorded five rodents (Akodon montensis, Oligoryzomys nigripes, Sooretamys angouya, Juliomys pictipes and the exotic Rattus rattus) and one marsupial (Didelphis albiventris). Both fragments were dominated by the generalist rodent A. montensis. Akodon montensis and O. nigripes showed similar habitat preferences: ground covered by rocks and higher values of vegetation obstruction. Sooretamys angouya preferred places with higher abundance of trees. Fruit availability was important for A. montensis and D. albiventris, highlighting the importance of this food resource for local wildlife, and the potential role of these species as seed predators and dispersers. Small species richness, the presence of an exotic species and high dominance level suggest that the study area is highly degraded.

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Simões, RO, A. Maldonado-Júnior, and JL Luque. "Helminth communities in three sympatric rodents from the Brazilian Atlantic Forest: contrasting biomass and numerical abundance." Brazilian Journal of Biology 72, no. 4 (November 2012): 909–14. http://dx.doi.org/10.1590/s1519-69842012000500018.

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The study of parasite body size is an important approach to understand the different patterns of helminth community structure, once it is usually analysed using only numerical descriptors which do not capture size heterogeneity among parasite species. In the present study, we compared the pattern in the helminth community of three sympatric wild rodent species Akodon cursor, A. montensis and Oligoryzomys nigripes using numerical abundance and biomass approaches. The cestode Rodentolepis akodontis was the worm with highest biomass in the three rodents. The trichostrongylid Stilestrongylus lanfrediae presented highest biomass in O. nigripes and represented 70% of the total numeric abundance of parasites. Interestingly, for Akodon spp. the species with more biomass represented less than 10% of the total numerical abundance. Parasites with the higher numeric abundance do not have the largest body size. Although the biomass pattern is different from numeric abundance, this difference does not influence in the helminth distribution community among the three sympatric hosts. The status change of a helminth species within the community due to its volumetric dominance might justify a new approach since parasites belonging to different taxa obtain resources from the host in different ways.

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MELO, GERUZA L., BARBARA MIOTTO, BRISA PERES, and NILTON C. CACERES. "Microhabitat of small mammals at ground and understorey levels in a deciduous, southern Atlantic Forest." Anais da Academia Brasileira de Ciências 85, no. 2 (June 2013): 727–36. http://dx.doi.org/10.1590/s0001-37652013000200017.

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Each animal species selects specific microhabitats for protection, foraging, or micro-climate. To understand the distribution patterns of small mammals on the ground and in the understorey, we investigated the use of microhabitats by small mammals in a deciduous forest of southern Brazil. Ten trap stations with seven capture points were used to sample the following microhabitats: liana, fallen log, ground litter, terrestrial ferns, simple-trunk tree, forked tree, and Piper sp. shrubs. Seven field phases were conducted, each for eight consecutive days, from September 2006 through January 2008. Four species of rodents (Akodon montensis, Sooretamys angouya, Oligoryzomys nigripes and Mus musculus) and two species of marsupials (Didelphis albiventris and Gracilinanus microtarsus) were captured. Captured species presented significant differences on their microhabitat use (ANOVA, p = 0.003), particularly between ground and understorey sites. Akodon montensis selected positively terrestrial ferns and trunks, S. angouya selected lianas, D. albiventris selected fallen trunks and Piper sp., and G. microtarsus choose tree trunks and lianas. We demonstrated that the local small-mammal assemblage does select microhabitats, with different types of associations between species and habitats. Besides, there is a strong evidence of habitat selection in order to diminish predation.

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Owen, Robert D., Jeremy V. Camp, Richard Sage, Laura Rodríguez, Vicente J. Martínez Bruyn, Ryan C. McAllister, and Colleen B. Jonsson. "Sympatry and habitat associations of sigmodontine rodents in a neotropical forest-savanna interface." Mammalia 84, no. 3 (March 26, 2020): 227–38. http://dx.doi.org/10.1515/mammalia-2019-0036.

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AbstractSmall mammal communities in the Neotropics are composed largely of sigmodontine rodents. However, many questions regarding these communities remain unanswered, especially those pertaining to fine-scale sympatry and habitat selection. To address this, we examined sigmodontine community structure and vegetation in the western margin of the Upper Paraná Atlantic Forest and the southwestern-most extent of the Cerrado (CE) (an extensive South American savanna ecoregion) of Paraguay. Vegetation classifications were derived from satellite imagery combined with maps based on extensive ground-based surveys. The three most abundant species (Akodon montensis, Hylaeamys megacephalus, and Oligoryzomys nigripes) were found most often in microsympatry with conspecifics, and were negatively associated with other species. Akodon montensis was associated with high forest (HF), and H. megacephalus with bamboo understory (BU), whereas O. nigripes did not exhibit a habitat preference. The first two species’ distributions within the landscape were found to be driven primarily by habitat selection, and O. nigripes by a behavioral response (avoidance) to the presence of the other two species. Moreover, habitat influences whether or not a particular species associates with, or avoids, conspecifics or other species.

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Liascovich, R. C., R. M. Barquez, and O. A. Reig. "A Karyological and Morphological Reassessment of Akodon (Abrothrix) Illuteus Thomas." Journal of Mammalogy 70, no. 2 (May 25, 1989): 386–91. http://dx.doi.org/10.2307/1381524.

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Lisanti, J. A., E. Pinna-Senn, M. I. Ortiz, G. Dalmasso, and S. Parisi de Fabro. "Karyotypic Relationship between Akodon azarae and A. boliviensis (Rodentia, Sigmodontinae)." CYTOLOGIA 65, no. 3 (2000): 253–59. http://dx.doi.org/10.1508/cytologia.65.253.

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Bianchi, N. O. "Akodon sex reversed females: the never ending story." Cytogenetic and Genome Research 96, no. 1-4 (2002): 60–65. http://dx.doi.org/10.1159/000063029.

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Braun, Janet K., Michael A. Mares, Brandi S. Coyner, and Ronald A. Van Den Bussche. "New species of Akodon (Rodentia: Cricetidae: Sigmodontinae) from central Argentina." Journal of Mammalogy 91, no. 2 (April 16, 2010): 387–400. http://dx.doi.org/10.1644/09-mamm-a-048.1.

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Diaz, M. M., R. M. Barquez, J. K. Braun, and M. A. Mares. "A New Species of Akodon (Muridae: Sigmodontinae) from Northwestern Argentina." Journal of Mammalogy 80, no. 3 (August 27, 1999): 786–98. http://dx.doi.org/10.2307/1383248.

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Carballal, Guadalupe, Cristina Videla, P. M. Cossio, F. Dulout, Ana M. Acuña, and N. O. Bianchi. "Experimental infection of akodon molinae (Rodentia, Cricetidae) with Junín virus." Journal of Medical Virology 19, no. 1 (May 1986): 47–54. http://dx.doi.org/10.1002/jmv.1890190108.

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Bassini-Silva, Ricardo, Matheus Huang-Bastos, Barry M. OConnor, Pavel Klimov, Cal Welbourn, Ron Ochoa, Darci Moraes Barros-Battesti, and Fernando de Castro Jacinavicius. "A New Genus and Species of Chiggers (Trombidiformes: Leeuwenhoekiidae) From Peru." Journal of Medical Entomology 58, no. 3 (February 10, 2021): 1166–70. http://dx.doi.org/10.1093/jme/tjab010.

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Abstract South American chiggers have historically been poorly studied, and this has continued into present times. Of the 33 genera in the family Leeuwenhoekiidae Womersley, only Odontacarus Ewing and Sasacarus Brennan & Jones have been reported in Peru. Here, we describe a new genus, Peruacarus n. gen., and a new species, Peruacarus anthurium n. sp., parasitizing Koford’s grass mouse, Akodon kofordi Myers & Patton, in Peru.

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Gonçalves, Gislene L., Mariana A. Faria-Correa, Adriano S. Cunha, and Thales R. O. Freitas. "Bark consumption by the spiny rat Euryzygomatomys spinosus (G. Fischer) (Echimyidae) on a Pinus taeda Linnaeus (Pinaceae) plantation in South Brazil." Revista Brasileira de Zoologia 24, no. 1 (March 2007): 260–63. http://dx.doi.org/10.1590/s0101-81752007000100037.

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Feeding damage caused by Euryzygomatomys spinosus (G. Fischer, 1814) (Echimyidae) is documented for a Pinus taeda Linnaeus (Pinaceae) plantation located in Cambará do Sul, Rio Grande do Sul State, Brazil. Under laboratory conditions, feeding acceptance of P. taeda trunk sections was tested with positive results for E. spinosus, but not for other three co-occurring sigmodontine rodents: Akodon montensis Thomas, 1913, Oligoryzomys nigripes (Olfers, 1818) and Delomys dorsalis (Hensel, 1872).

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Moreira, Rafael Quirino, Vanessa Do Nascimento Ramos, Adriane Suzin, Diego Garcia Ramirez, Paulo Ricardo De Oliveira Roth, Maria Marlene Martins, Anna Monteiro Correia Lima, and Matias Pablo Juan Szabó. "Ticks on small mammals from an ecotone region impacted by rural activities in Brazil." Systematic and Applied Acarology 26, no. 2 (February 2, 2021): 427–37. http://dx.doi.org/10.11158/saa.26.2.7.

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We evaluated the role of communities of small mammals from three distinct areas in a region of Cerrado mixed with Atlantic Forest remains for maintenance of tick fauna. Thirty-nine marsupials (Gracilinanus agilis, n = 34; Marmosa paraguaiana, n = 4; Didelphis albiventris, n = 1) and 33 rodents (Oecomys cleberi, n = 10; Nectomys squamipes, n = 4; Calomys tener, n = 4; Hylaeamys megacephalus, n = 4; Akodon sp., n = 3; Rattus rattus, n = 3; Cerradomys subflavus, n = 2; Mus musculus, n = 2; Rhipidomys macrurus, n = 1) were captured. Solely G. agilis and the four rodent species (N. squamipes, R. macrurus, C. subflavus and Akodon sp.) were infested. Four tick species were collected (Amblyomma dubitatum, Amblyomma sculptum, Ixodes loricatus and Ornithodoros mimon). A. dubitatum was the most abundant tick species on hosts. Capture success was higher in the dry season, but the infestation was similar in both seasons. Forested habitats, particularly riparian forests, resulted in higher number of hosts and ticks collected (from hosts and from vegetation), compared to pastures and anthropized sites. The association between C. subflavus and I. loricatus and between A. dubitatum and N. squamipes observed here is the first recorded in Cerrado biome. Areas with more patches of forest, including the Atlantic Forest fragments, tend to present a richest community of small mammals and associated ticks.

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Araújo, Naiara Pereira, Gustavo Campos Silva Kuhn, Flávia Nunes Vieira, Thaís Queiroz Morcatty, Adriano Pereira Paglia, and Marta Svartman. "Comparative Genomic In Situ Hybridization and the Possible Role of Retroelements in the Karyotypic Evolution of Three Akodontini Species." International Journal of Genomics 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/5935380.

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South American Akodontini rodents are characterized by a large number of chromosome rearrangements. Among them, the genus Akodon has been extensively analyzed with classical and molecular cytogenetics, which allowed the identification of a large number of intra- and interspecific chromosomal variation due to Robertsonian rearrangements, pericentric inversions, and heterochromatin additions/deletions. In order to shed some light on the cause of these rearrangements, we comparatively analyzed the karyotypes of three Akodontini species, Akodon cursor (2n = 14, FN = 19), A. montensis (2n = 24, FN = 42), and Necromys lasiurus (2n = 34, FN = 34), after GTG- and CBG-banding. The karyotypes differed by Robertsonian rearrangements, pericentric inversions, centromere repositioning, and heterochromatin variation. Genome comparisons were performed through interspecific fluorescent in situ hybridization (FISH) with total genomic DNAs of each species as probes (GISH). Our results revealed considerable conservation of the euchromatic portions among the three karyotypes suggesting that they mostly differ in their heterochromatic regions. FISH was also performed to assess the distribution of telomeric sequences, long and short interspersed repetitive elements (LINE-1 and B1 SINE) and of the endogenous retrovirus mysTR in the genomes of the three species. The results led us to infer that transposable elements have played an important role in the enormous chromosome variation found in Akodontini.

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Oliveira da Silva, Willam, Stella Miranda Malcher, Adenilson Leão Pereira, Julio Cesar Pieczarka, Malcolm Andrew Ferguson-Smith, Patricia Caroline Mary O’Brien, Ana Cristina Mendes-Oliveira, Lena Geise, and Cleusa Yoshiko Nagamachi. "Chromosomal Signatures Corroborate the Phylogenetic Relationships within Akodontini (Rodentia, Sigmodontinae)." International Journal of Molecular Sciences 21, no. 7 (March 31, 2020): 2415. http://dx.doi.org/10.3390/ijms21072415.

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Comparative chromosome-painting analysis among highly rearranged karyotypes of Sigmodontinae rodents (Rodentia, Cricetidae) detects conserved syntenic blocks, which are proposed as chromosomal signatures and can be used as phylogenetic markers. In the Akodontini tribe, the molecular topology (Cytb and/or IRBP) shows five low-supported clades (divisions: “Akodon”, “Bibimys”, “Blarinomys”, “Oxymycterus”, and “Scapteromys”) within two high-supported major clades (clade A: “Akodon”, “Bibimys”, and “Oxymycterus”; clade B: “Blarinomys” and “Scapteromys”). Here, we examine the chromosomal signatures of the Akodontini tribe by using Hylaeamys megacephalus (HME) probes to study the karyotypes of Oxymycterus amazonicus (2n = 54, FN = 64) and Blarinomys breviceps (2n = 28, FN = 50), and compare these data with those from other taxa investigated using the same set of probes. We strategically employ the chromosomal signatures to elucidate phylogenetic relationships among the Akodontini. When we follow the evolution of chromosomal signature states, we find that the cytogenetic data corroborate the current molecular relationships in clade A nodes. We discuss the distinct events that caused karyotypic variability in the Oxymycterus and Blarinomys genera. In addition, we propose that Blarinomys may constitute a species complex, and that the taxonomy should be revised to better delimit the geographical boundaries and their taxonomic status.

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AULCHENKO, YU S., L. O. ARARIPE, P. S. D'ANDREA, A. A. SHISHKIN, R. CERQUEIRA, P. M. BORODIN, and T. I. AXENOVICH. "Inheritance of litter size at birth in the Brazilian grass mouse (Akodon cursor, Sigmodontinae, Rodentia)." Genetical Research 80, no. 1 (August 2002): 55–62. http://dx.doi.org/10.1017/s0016672302005724.

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By means of complex segregation analysis we studied the inheritance of litter size in two large pedigrees of captive-bred colonies of the Brazilian grass mouse Akodon cursor. Genetic analysis has revealed a highly significant influence of genetic factors on the variation of litter size (heritability, h2, was estimated as 0.44). The inheritance followed the classical polygene model: neither the major-gene model nor the polygene with unequal contribution model described the data significantly better.

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Pereira, LG, and L. Geise. "Karyotype composition of some rodents and marsupials from Chapada Diamantina (Bahia, Brasil)." Brazilian Journal of Biology 67, no. 3 (August 2007): 509–18. http://dx.doi.org/10.1590/s1519-69842007000300016.

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The Chapada Diamantina (CD) is located in Bahia State, between 11-14° S and 41-43° W, being part of the Serra do Espinhaço. The occurrence of different habitats and transition areas permits an interesting mammal fauna composition, with species from different biomes living in sympatry. Species of Didelphimorphia and Rodentia are important members of mammal communities in almost all different habitats, and morphological and cytogenetic characters are important for a correct identification of most of these species. In this work 258 specimens of small mammals from the orders Didelphimorphia (six genera and six species) and Rodentia (two families, five Sigmodontinae tribes, nine genera and 11 species) were collected during the whole field work (44 nights with traps). Chromosome preparations were obtained from 145 specimens from the species: Marmosops incanus, Gracilinanus microtarsus, Monodelphis domestica, Akodon aff. cursor, Necromys lasiurus, Cerradomys sp., Oligoryzomys fornesi, O. nigripes, O. rupestris, Calomys expulsus, Rhipidomys macrurus, Wiedomys pyrrhorhinus and Thrichomys inermis. Didelphis albiventris, Micoureus demerarae, Thylamys karymii and Nectomys sp. were identified by morphological characters. Most analyzed specimens do not show karyotype variation. However, numerical chromosomic variation was found in two individuals of Akodon aff. cursor (2n = 15) and in one individual of Cerradomys sp. (2n = 51). Structural variation in karyotype was observed in seven individuals of Cerradomys sp., showing one additional pair of metacentric chromosomes.

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Onofrio, Valeria Castilho, Fernanda Aparecida Nieri-Bastos, Janio dos Santos Sampaio, João Fábio Soares, Maria José de Jesus Silva, and Darci Moraes Barros-Battesti. "Noteworthy records of Ixodes schulzei(Acari: Ixodidae) on rodents from the State of Parana, southern Brazil." Revista Brasileira de Parasitologia Veterinária 22, no. 1 (March 2013): 159–61. http://dx.doi.org/10.1590/s1984-29612013000100030.

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Ixodes schulzei Aragão & Fonseca is an endemic tick to Brazil and has already been reported in the northern (State of Rondonia), southeastern (States of Minas Gerais, Rio de Janeiro and Sao Paulo) and southern (State of Santa Catarina) regions, always found in association with the water rat Nectomys squamipes(Brandt). This communication records the first occurrence of this tick species in the State of Parana, southern region of Brazil, and it constitutes its first report on Akodon montensis (Thomas) andOryzomys russatus (Wagner) hosts.

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