Relevant bibliographies by topics / Squamate Reptiles

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Academic literature on the topic 'Squamate Reptiles'

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Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Squamate Reptiles"

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Pie, Marcio R., Leonardo L. F. Campos, Andreas L. S. Meyer, and Andressa Duran. "The evolution of climatic niches in squamate reptiles." Proceedings of the Royal Society B: Biological Sciences 284, no. 1858 (July 5, 2017): 20170268. http://dx.doi.org/10.1098/rspb.2017.0268.

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Despite the remarkable diversity found in squamate reptiles, most of their species tend to be found in warm/dry environments, suggesting that climatic requirements played a crucial role in their diversification, yet little is known about the evolution of their climatic niches. In this study, we integrate climatic information associated with the geographical distribution of 1882 squamate species and their phylogenetic relationships to investigate the tempo and mode of climatic niche evolution in squamates, both over time and among lineages. We found that changes in climatic niche dynamics were pronounced over their recent squamate evolutionary history, and we identified extensive evidence for rate heterogeneity in squamate climatic niche evolution. Most rate shifts involved accelerations, particularly over the past 50 Myr. Most squamates occupy similar regions of the climatic niche space, with only a few lineages diversifying into colder and humid climatic conditions. The changes from arid to mesic conditions in some regions of the globe may have provided opportunities for climatic niche evolution, although most lineages tended to remain near their ancestral niche. Variation in rates of climatic niche evolution seems common, particularly in response to the availability of new climatic conditions over evolutionary time.
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Frýdlová, Petra, Jana Mrzílková, Martin Šeremeta, Jan Křemen, Jan Dudák, Jan Žemlička, Bernd Minnich, et al. "Determinate growth is predominant and likely ancestral in squamate reptiles." Proceedings of the Royal Society B: Biological Sciences 287, no. 1941 (December 23, 2020): 20202737. http://dx.doi.org/10.1098/rspb.2020.2737.

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Body growth is typically thought to be indeterminate in ectothermic vertebrates. Indeed, until recently, this growth pattern was considered to be ubiquitous in ectotherms. Our recent observations of a complete growth plate cartilage (GPC) resorption, a reliable indicator of arrested skeletal growth, in many species of lizards clearly reject the ubiquity of indeterminate growth in reptiles and raise the question about the ancestral state of the growth pattern. Using X-ray micro-computed tomography (µCT), here we examined GPCs of long bones in three basally branching clades of squamate reptiles, namely in Gekkota, Scincoidea and Lacertoidea. A complete loss of GPC, indicating skeletal growth arrest, was the predominant finding. Using a dataset of 164 species representing all major clades of lizards and the tuataras, we traced the evolution of determinate growth on the phylogenetic tree of Lepidosauria. The reconstruction of character states suggests that determinate growth is ancestral for the squamate reptiles (Squamata) and remains common in the majority of lizard lineages, while extended (potentially indeterminate) adult growth evolved several times within squamates. Although traditionally associated with endotherms, determinate growth is coupled with ectothermy in this lineage. These findings combined with existing literature suggest that determinate growth predominates in both extant and extinct amniotes.
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Adams, Richard H., Heath Blackmon, Jacobo Reyes-Velasco, Drew R. Schield, Daren C. Card, Audra L. Andrew, Nyimah Waynewood, and Todd A. Castoe. "Microsatellite landscape evolutionary dynamics across 450 million years of vertebrate genome evolution." Genome 59, no. 5 (May 2016): 295–310. http://dx.doi.org/10.1139/gen-2015-0124.

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The evolutionary dynamics of simple sequence repeats (SSRs or microsatellites) across the vertebrate tree of life remain largely undocumented and poorly understood. In this study, we analyzed patterns of genomic microsatellite abundance and evolution across 71 vertebrate genomes. The highest abundances of microsatellites exist in the genomes of ray-finned fishes, squamate reptiles, and mammals, while crocodilian, turtle, and avian genomes exhibit reduced microsatellite landscapes. We used comparative methods to infer evolutionary rates of change in microsatellite abundance across vertebrates and to highlight particular lineages that have experienced unusually high or low rates of change in genomic microsatellite abundance. Overall, most variation in microsatellite content, abundance, and evolutionary rate is observed among major lineages of reptiles, yet we found that several deeply divergent clades (i.e., squamate reptiles and mammals) contained relatively similar genomic microsatellite compositions. Archosauromorph reptiles (turtles, crocodilians, and birds) exhibit reduced genomic microsatellite content and the slowest rates of microsatellite evolution, in contrast to squamate reptile genomes that have among the highest rates of microsatellite evolution. Substantial branch-specific shifts in SSR content in primates, monotremes, rodents, snakes, and fish are also evident. Collectively, our results support multiple major shifts in microsatellite genomic landscapes among vertebrates.
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Stobo-Wilson, Alyson M., Brett P. Murphy, Sarah M. Legge, David G. Chapple, Heather M. Crawford, Stuart J. Dawson, Chris R. Dickman, et al. "Reptiles as food: predation of Australian reptiles by introduced red foxes compounds and complements predation by cats." Wildlife Research 48, no. 5 (2021): 470. http://dx.doi.org/10.1071/wr20194.

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ContextInvasive species are a major cause of biodiversity loss across much of the world, and a key threat to Australia’s diverse reptile fauna. There has been no previous comprehensive analysis of the potential impact of the introduced European red fox, Vulpes vulpes, on Australian reptiles. AimsWe seek to provide an inventory of all Australian reptile species known to be consumed by the fox, and identify characteristics of squamate species associated with such predation. We also compare these tallies and characteristics with reptile species known to be consumed by the domestic cat, Felis catus, to examine whether predation by these two introduced species is compounded (i.e. affecting much the same set of species) or complementary (affecting different groups of species). Methods We collated records of Australian reptiles consumed by foxes in Australia, with most records deriving from fox dietary studies (tallying >35000 samples). We modelled presence or absence of fox predation records against a set of biological and other traits, and population trends, for squamate species. Key resultsIn total, 108 reptile species (~11% of Australia’s terrestrial reptile fauna) have been recorded as consumed by foxes, fewer than that reported for cats (263 species). Eighty-six species have been reported to be eaten by both predators. More Australian turtle species have been reported as consumed by foxes than by cats, including many that suffer high levels of predation on egg clutches. Twenty threatened reptile species have been reported as consumed by foxes, and 15 by cats. Squamate species consumed by foxes are more likely to be undergoing population decline than those not known to be consumed by foxes. The likelihood of predation by foxes increased with squamate species’ adult body mass, in contrast to the relationship for predation by cats, which peaked at ~217g. Foxes, but not cats, were also less likely to consume venomous snakes. ConclusionsThe two introduced, and now widespread, predators have both compounding and complementary impacts on the Australian reptile fauna. ImplicationsEnhanced and integrated management of the two introduced predators is likely to provide substantial conservation benefits to much of the Australian reptile fauna.
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LaDage, L. D., T. C. Roth, A. M. Cerjanic, B. Sinervo, and V. V. Pravosudov. "Spatial memory: are lizards really deficient?" Biology Letters 8, no. 6 (August 29, 2012): 939–41. http://dx.doi.org/10.1098/rsbl.2012.0527.

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In many animals, behaviours such as territoriality, mate guarding, navigation and food acquisition rely heavily on spatial memory abilities; this has been demonstrated in diverse taxa, from invertebrates to mammals. However, spatial memory ability in squamate reptiles has been seen as possible, at best, or non-existent, at worst. Of the few previous studies testing for spatial memory in squamates, some have found no evidence of spatial memory while two studies have found evidence of spatial memory in snakes, but have been criticized based on methodological issues. We used the Barnes maze, a common paradigm to test spatial memory abilities in mammals, to test for spatial memory abilities in the side-blotched lizard ( Uta stansburiana ). We found the existence of spatial memory in this species using this spatial task. Thus, our study supports the existence of spatial memory in this squamate reptile species and seeks to parsimoniously align this species with the diverse taxa that demonstrate spatial memory ability.
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Bhullar, Bhart-Anjan S. "A Reevaluation of the Unusual Abdominal Musculature of Squamate Reptiles (Reptilia: Squamata)." Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology 292, no. 8 (August 2009): 1154–61. http://dx.doi.org/10.1002/ar.20955.

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Salles, Rodrigo De Oliveira Lula, Luiz Norberto Weber, and Thiago Silva-Soares. "Reptiles, Squamata, Parque Natural Municipal da Taquara, municipality of Duque de Caxias, state of Rio de Janeiro, Southeastern Brazil." Check List 6, no. 2 (May 1, 2010): 280. http://dx.doi.org/10.15560/6.2.280.

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Herein we report a list of the reptiles from Parque Natural Municipal da Taquara, municipality of Duque de Caxias, state of Rio de Janeiro, southeastern Brazil, an area situated in the Atlantic Rainforest Domain. The study was carried out from September 2006 to October 2008. We recorded 31 species of Squamate reptiles: one species of the family Amphisbaenidae; eight species of lizards of the families Anguidae (n = 1), Gekkonidae (1), Phyllodactylidae (1), Polychrotidae (1), Scincidae (1), Teiidae (2), and Tropiduridae (1); and 22 species of snakes of the families Boidae (2), Colubridae (6), Dipsadidae (11), Elapidae (1), and Viperidae (2). Our study indicates that the PNMT is an important area for the conservation of the Squamate reptile assemblages that inhabit lowlands of Atlantic Rainforest in Brazil.
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Booth, Warren, Charles F. Smith, Pamela H. Eskridge, Shannon K. Hoss, Joseph R. Mendelson, and Gordon W. Schuett. "Facultative parthenogenesis discovered in wild vertebrates." Biology Letters 8, no. 6 (September 12, 2012): 983–85. http://dx.doi.org/10.1098/rsbl.2012.0666.

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Facultative parthenogenesis (FP)—asexual reproduction by bisexual species—has been documented in a variety of multi-cellular organisms but only recently in snakes, varanid lizards, birds and sharks. Unlike the approximately 80 taxa of unisexual reptiles, amphibians and fishes that exist in nature, FP has yet to be documented in the wild. Based on captive documentation, it appears that FP is widespread in squamate reptiles (snakes, lizards and amphisbaenians), and its occurrence in nature seems inevitable, yet the task of detecting FP in wild individuals has been deemed formidable. Here we show, using microsatellite DNA genotyping and litter characteristics, the first cases of FP in wild-collected pregnant females and their offspring of two closely related species of North American pitviper snakes—the copperhead ( Agkistrodon contortrix ) and cottonmouth ( Agkistrodon piscivorus ). Our findings support the view that non-hybrid origins of parthenogenesis, such as FP, are more common in squamates than previously thought. With this confirmation, FP can no longer be viewed as a rare curiosity outside the mainstream of vertebrate evolution. Future research on FP in squamate reptiles related to proximate control of induction, reproductive competence of parthenogens and population genetics modelling is warranted.
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Wiens, John J., Carl R. Hutter, Daniel G. Mulcahy, Brice P. Noonan, Ted M. Townsend, Jack W. Sites, and Tod W. Reeder. "Resolving the phylogeny of lizards and snakes (Squamata) with extensive sampling of genes and species." Biology Letters 8, no. 6 (September 19, 2012): 1043–46. http://dx.doi.org/10.1098/rsbl.2012.0703.

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Squamate reptiles (lizards and snakes) are one of the most diverse groups of terrestrial vertebrates. Recent molecular analyses have suggested a very different squamate phylogeny relative to morphological hypotheses, but many aspects remain uncertain from molecular data. Here, we analyse higher-level squamate phylogeny with a molecular dataset of unprecedented size, including 161 squamate species for up to 44 nuclear genes each (33 717 base pairs), using both concatenated and species-tree methods for the first time. Our results strongly resolve most squamate relationships and reveal some surprising results. In contrast to most other recent studies, we find that dibamids and gekkotans are together the sister group to all other squamates. Remarkably, we find that the distinctive scolecophidians (blind snakes) are paraphyletic with respect to other snakes, suggesting that snakes were primitively burrowers and subsequently re-invaded surface habitats. Finally, we find that some clades remain poorly supported, despite our extensive data. Our analyses show that weakly supported clades are associated with relatively short branches for which individual genes often show conflicting relationships. These latter results have important implications for all studies that attempt to resolve phylogenies with large-scale phylogenomic datasets.
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Ananjeva, N. B. "Current State of the Problems in the Phylogeny of Squamate Reptiles (Squamata, Reptilia)." Biology Bulletin Reviews 9, no. 2 (March 2019): 119–28. http://dx.doi.org/10.1134/s2079086419020026.

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Dissertations / Theses on the topic "Squamate Reptiles"

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Rehorek, Susan Joyce. "A potential role of the Squamate Harderian gland in vomerolfaction /." Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phr3451.pdf.

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Al-Hassawi, Amal M. A. "The osteology and myology of the cranio-cervical region in squamate reptiles : a comparative study." Thesis, University College London (University of London), 2004. http://discovery.ucl.ac.uk/1446505/.

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Modem squamates (lizards, snakes and amphisbaenians) form a highly successful group of terrestrial reptiles with a range of habitats and lifestyles. Some features of their anatomy (head, limbs) are relatively well-studied, but there are significant gaps in our knowledge. The neck is one such area. It provides the mobile unit between the head and the body, serving for the attachment of the musculature to the head, the forelimb and the pharyngeal region. The mobility of the head is dependent on arrangement of such muscles and on the structure of the craniovertebral and intervertebral joints across which the muscles act. Preliminary studies have shown interesting patterns of variation in both skeletal anatomy and musculature. The aim of the project was to explore, catalogue and analyse this variation, and to find functional and/ or taxonomic explanations for it. Details of the surface morphology of bones, and the origin and insertion of muscles were recorded for Caiman, Sphenodon and squamates (including the amphisbaenian Diplometopon and the snake Trimeresurus). Where possible, comparisons were also made within and between taxa to determine levels of inter- and intraspecific variation, as well as variation between genera. Several limbless or limb-reduced taxa were compared to assess levels of convergence in these forms. The results of the study suggest that some craniocervical characters may be phylogenetically useful although there is a high level of variation within and between species. Craniocervical characters generally support the monophyly of Lepidosauria, Squamata and Sderoglossa (all non-iguanian squamates); and major clades like Iguarda, Gekkota, Sdncomorpha and Angtiimorpha. Also supported are groups like Acrodonta (agamids + chamaeleons) and Scincoidea; and families like Chamaeleonidae and Varanidae. Within Squamata, craniocervical features seem to place Gekkota closer to Anguimorpha than Sdncomorpha. Varanid lizards and snakes (Trimeresurus) share muscular features (origin and extension of longus colli in the craniocervical region), although varanids themselves are distinctive in their neck morphology. Amongst the limbless taxa examined, the amphisbaenian Diplometopon and the snake Trimeresurus had a spedalised neck morphology which differs from that of lizards, but the craniocervical features of Diplometojjon resembled those of gekkotans and limbed anguimorphs (e.g. varanids) more than sdncomorphs.
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Parker, Scott Landsborough. "Physiological and Ecological Constraints on the Evolution of Viviparity in Sceloporine Lizards." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/26050.

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The purpose of this study was to evaluate putative physiological and ecological constraints on the evolution of viviparity in sceloporine lizards. In Chapters one and two, I investigated the role of in utero oxygen availability as a constraint on the capacity to support embryonic development during extended egg retention. I incubated eggs of sceloporine lizards under conditions that simulated retention in the oviduct under a range of oxygen partial pressures. In Chapter one, I tested the hypothesis that embryos of the oviparous lizard Sceloporus undulatus from a high-latitude population are laid at more advanced developmental stages and have a higher developmental rate at low partial pressure oxygen (pO2) under simulated in utero conditions than embryos from a low-latitude population. This hypothesis was rejected; embryos from the two populations did not differ in embryonic stage at oviposition or developmental rate when incubated under simulated in utero conditions at low pO2. In Chapter two I tested the hypothesis that the degree of embryonic development attained by reptilian embryos in utero is directly related to in utero pO2. The species chosen for the study differed in their capacity to support embryonic development during egg retention and were characterized by developmental arrest (Urosaurus ornatus), retarded development (Sceloporus virgatus), and normal development (Sceloporus scalaris) when eggs are retained past the normal time of oviposition. The estimated in utero pO2's for the three species increased in the order of U. ornatus (5-6 kPa) < S. virgatus (9-11 kPa) < S. scalaris (> 11 kPa). These results indicate that in utero oxygen availability is associated with interspecifc differences in the capacity to support embryonic development during extended egg retention. In Chapter three I tested the hypothesis that embryo thermal requirements determine the northern distributional limit of Sceloporus undulatus. I incubated eggs of S. undulatus under temperature treatments that simulated the thermal environment that eggs would experience if located in nests within their geographic range at 37 °N and at latitudes north of the species present geographic range at 42 and 44 °N. Incubation temperatures simulating nests at 44 °N prolonged incubation and resulted in hatchlings with shorter tails, shorter hind limb span, slower growth and lower survival than hatchlings from eggs incubated at temperatures simulating nests at 37 and 42 °N. I also predicted that the northernmost distributional limit of S. undulatus would be associated with locations that provide the minimum heat sum (degree-days) required to complete embryonic development. Eighty-four percent of location between 37-40 °N had > 495 degree-days above a threshold of 17 °C accumulated during June-September compared to eleven percent of locations between 41-50 °N. These results are consistent with the hypothesis that incubation temperature is an important factor limiting the geographic distributions of oviparous reptile species at high latitudes and high elevations.
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Delgado, Christophe Sidney. "L'Amélogénine, protéine majeure de l'émail dentaire : origine, analyses évolutive et phylogénétique chez les Amniotes et recherche de son expression lors de la formation des dents de Chalcides viridanus (Squamate,Scincidé)." Paris 7, 2002. http://www.theses.fr/2002PA077066.

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Fuga, Adriana [UNESP]. "Determinantes da resposta termofílica pós-prandial em Crotalus durissus terrificus (Squamata: Viperidae)." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/99552.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Virtualmente todos os processos biológicos são influenciados pela temperatura. Desta forma, os animais, em geral, investem tempo e energia para regular a temperatura corpórea (Tc) ao passo que os animais ectotérmicos, em particular, têm sua biologia fortemente moldada pela termorregulação comportamental. No caso das serpentes o desempenho em cada atividade em particular pode ser otimizado ou prejudicado em diferentes temperaturas. Como consequência, serpentes podem alterar a temperatura corpórea selecionada com base no tipo de atividade que está sendo exercida no momento e de acordo com a disponibilidade térmica do ambiente. Um exemplo bem conhecido é a seleção de micro-habitats com temperatura mais elevada levando a um aumento significativo da Tc após a ingestão do alimento, comportamento referido como “resposta termofílica pós-prandial”. Este aumento da Tc sabidamente acelera a digestão e, possivelmente, traz beneficios no orçamento de tempo e energia das serpentes. No entanto, a busca de sitios térmicos mais propícios deve acarretar em custos e riscos, especialmente em serpentes recentemente alimentadas que tem a capacidade de locomoção reduzida e, portanto, poderia torná-las mais vulneráveis à predação. Como as serpentes solucionam este conflito entre os benefícios providos por um aumento da Tc durante a digestão do alimento e os riscos envolvidos com a termorregulação é, atualmente, ignorado. Desta forma, o objetivo do presente estudo foi documentar a resposta termofílica pós-prandial da cascavel, Crotalus durissus terrificus, em condições de laboratório, disponibilizando ou não abrigos (tocas) em um gradiente térmico. Nossos resultados permitem concluir que C. d. terrificus apresenta um ciclo circadiano de variação da Tc, com temperaturas mais altas registradas no final da tarde e início da noite...
Virtually all biological processes are influenced by temperature. Thus, animals generally invest time and energy to regulate body temperature (Tc) while ectotherms, in particular, have their biology strongly shaped by behavioral thermoregulation. In snakes, performance in each particular activity can be enhanced or impaired at different temperatures. Consequently, snakes can alter body temperature selected based on the type of activity being carried out at the time and according to the availability of the thermal environment. A well-known example is the selection of micro-habitats with higher temperature leads to a significant increase in Tc after ingestion of food, behavior referred to as “post-prandial thermophilic response. This increase of Tc accelerates digestion and possibly brings benefits in the budget of time and energy of snakes. However, the search for thermal sites should result in more favorable costs and risks, especially recently fed into serpents which is capable of locomotion reduced and therefore could make them more vulnerable to predators. As snakes resolve this conflict between the benefits provided by an increase in Tc during the digestion of food and the risks involved with thermoregulation is currently ignored. Thus, the objective of this study was to document the post-prandial thermophilic response of rattlesnake, Crotalus durissus terrificus, under laboratory conditions, offering or not shelters (burrows) in a thermal gradient. Our results suggest that C. d. terrificus has a circadian variation of Tc with higher temperatures recorded in the late afternoon and early evening. The feed caused an increase in mean body temperature of C. d. terrificus and this increase was primarily due to an increase in minimum temperatures in the early days of digestion. With the availability of shelters, the thermoregulatory behavior... (Complete abstract click electronic access below)
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Fuga, Adriana. "Determinantes da resposta termofílica pós-prandial em Crotalus durissus terrificus (Squamata: Viperidae) /." Rio Claro : [s.n.], 2012. http://hdl.handle.net/11449/99552.

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Orientador: Denis Otávio Vieira de Andrade
Banca: Cleo Alcantara Costa Leite
Banca: Jose Eduardo de Carvalho
Resumo: Virtualmente todos os processos biológicos são influenciados pela temperatura. Desta forma, os animais, em geral, investem tempo e energia para regular a temperatura corpórea (Tc) ao passo que os animais ectotérmicos, em particular, têm sua biologia fortemente moldada pela termorregulação comportamental. No caso das serpentes o desempenho em cada atividade em particular pode ser otimizado ou prejudicado em diferentes temperaturas. Como consequência, serpentes podem alterar a temperatura corpórea selecionada com base no tipo de atividade que está sendo exercida no momento e de acordo com a disponibilidade térmica do ambiente. Um exemplo bem conhecido é a seleção de micro-habitats com temperatura mais elevada levando a um aumento significativo da Tc após a ingestão do alimento, comportamento referido como "resposta termofílica pós-prandial". Este aumento da Tc sabidamente acelera a digestão e, possivelmente, traz beneficios no orçamento de tempo e energia das serpentes. No entanto, a busca de sitios térmicos mais propícios deve acarretar em custos e riscos, especialmente em serpentes recentemente alimentadas que tem a capacidade de locomoção reduzida e, portanto, poderia torná-las mais vulneráveis à predação. Como as serpentes solucionam este conflito entre os benefícios providos por um aumento da Tc durante a digestão do alimento e os riscos envolvidos com a termorregulação é, atualmente, ignorado. Desta forma, o objetivo do presente estudo foi documentar a resposta termofílica pós-prandial da cascavel, Crotalus durissus terrificus, em condições de laboratório, disponibilizando ou não abrigos (tocas) em um gradiente térmico. Nossos resultados permitem concluir que C. d. terrificus apresenta um ciclo circadiano de variação da Tc, com temperaturas mais altas registradas no final da tarde e início da noite... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Virtually all biological processes are influenced by temperature. Thus, animals generally invest time and energy to regulate body temperature (Tc) while ectotherms, in particular, have their biology strongly shaped by behavioral thermoregulation. In snakes, performance in each particular activity can be enhanced or impaired at different temperatures. Consequently, snakes can alter body temperature selected based on the type of activity being carried out at the time and according to the availability of the thermal environment. A well-known example is the selection of micro-habitats with higher temperature leads to a significant increase in Tc after ingestion of food, behavior referred to as "post-prandial thermophilic response". This increase of Tc accelerates digestion and possibly brings benefits in the budget of time and energy of snakes. However, the search for thermal sites should result in more favorable costs and risks, especially recently fed into serpents which is capable of locomotion reduced and therefore could make them more vulnerable to predators. As snakes resolve this conflict between the benefits provided by an increase in Tc during the digestion of food and the risks involved with thermoregulation is currently ignored. Thus, the objective of this study was to document the post-prandial thermophilic response of rattlesnake, Crotalus durissus terrificus, under laboratory conditions, offering or not shelters (burrows) in a thermal gradient. Our results suggest that C. d. terrificus has a circadian variation of Tc with higher temperatures recorded in the late afternoon and early evening. The feed caused an increase in mean body temperature of C. d. terrificus and this increase was primarily due to an increase in minimum temperatures in the early days of digestion. With the availability of shelters, the thermoregulatory behavior... (Complete abstract click electronic access below)
Mestre
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Spinner, Marlene [Verfasser]. "Funktionelle Mikroornamentation der Squamata (Reptilia) / Marlene Spinner." Bonn : Universitäts- und Landesbibliothek Bonn, 2013. http://d-nb.info/1044869305/34.

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ABRANTES, Stephenson Hallison Formiga. "Revisão dos lagarto Cercosaura do grupo Argulus (Reptilia : Squamata: Gymnophthalmidae)." Universidade Federal do Pará, 2008. http://repositorio.ufpa.br/jspui/handle/2011/4265.

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A taxonomia dos lagartos Gymnophthalmidae do gênero Cercosaura Wagler, 1830 foi recentemente modificada com a inclusão dos gêneros Pantodactylus e Prionodactylus. Como reconhecido atualmente, o gênero Cercosaura contêm 11 espécies. Entretanto, divergências na literatura recente indicam que o nome Cercosaura argulus pode abranger um grupo de espécies. O presente estudo examinou os Cercosaura com frontonasal dividida, aqui chamado grupo argulus, que inclui as espécies nominais: Cercosaura argulus Peters, 1863 e Prionodactylus oshaughnessyi Boulenger, 1885. Um total de 151 espécimes de 41 localidades foram estudados com base em cinco caracteres morfométricos e 22 caracteres merísticos. Os espécimes foram divididos em três grupos, de acordo com os caracteres previamente considerados como diagnósticos das duas espécies nominais, em seguida Cercosaura oshaughnessyi foi dividido em dois grupos: um grupo do oeste e um grupo da Guiana. Uma Análise de Função Discriminante (AFD) foi utilizada para comparar estes três grupos. Inicialmente, uma Análise de Componentes Principais (PCA) foi utilizada para: (1) eliminar a influência do tamanho nas comparações (resíduos dos dados morfométricos com o primeiro fator de uma PCA foram calculados e utilizados em todas as análises estatísticas subseqüentes), e (2) para selecionar um menor número de variáveis merísticas para serem utilizadas na AFD. Os resultados indicam que C. argulus e C. oshaughnessyi diferem principalmente pela presença de poros pré-anais e número de escamas ao redor do meio do corpo. Cercosaura oshaughnessyi é considerada uma espécie válida, restrita ao oeste da Amazônia, enquanto uma terceira espécie não descrita de Cercosaura com frontonasal dividida ocorre na Guiana Francesa e Amapá (Brasil).
Taxonomy of the lizard genus Cercosaura Wagler, 1830, Gymnophthalmidae, has recently changed to incorporate the former genera Pantodactylus and Prionodactylus. As currently recognized the genus contains 11 species. However, divergences in the literature indicate that the name Cercosaura argulus may encompass a group of species. The present study investigates the Cercosaura with divided frontonasal, here called “argulus group”, that includes the nominal species Cercosaura argulus Peters, 1863 and Prionodactylus oshaughnessyi Boulenger, 1885. A total of 151 specimens of 41 localities were studied on basis of five morphometric and 22 meristic characters. Specimens were divided into three groups, according to characters previously considered diagnostic of the two nominal species, further dividing ‘C. oshaughnessyi’ into a western and a Guianan group. A Discriminant Function Analysis (DFA) was used to compare these three groups. Previously, Principal Component Analyses (PCA) were performed to (1) eliminate the influence of size in the comparisons (residuals of morphometric data with the first axis of a PCA were calculated and used in all subsequent statistical analyses); and (2) to select a smaller number of meristic variables to be used in the DFA. Results indicate that C. argulus and C. oshaughnessyi differ mainly by the presence of preanal pores, body length, and number of scales around midbody. Cercosaura oshaughnessyi is considered a valid species, restricted to western Amazonia, while a third, undescribed species of Cercosaura with divided frontonasal occurs in French Guiana and Amapá (Brazil).
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9

Sartori, Marina Rincon. "Excreção de nitrogênio em embriões de iguana Iguana iguana (Reptilia; Squamata)." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/41/41135/tde-24082012-113604/.

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Tabelas de estágio embrionário podem ser utilizadas para detectar semelhanças e diferenças de caracteres entre grupos e como ferramenta para estudos baseados na fase embrionária. Neste estudo, ovos do lagarto Iguana iguana foram utilizados para a elaboração de uma tabela de estágios e para determinar o padrão de excreção durante o desenvolvimento. Iguana é um modelo conveniente por produzir numerosas desovas de ovos de tamanho grandes, propiciando um fácil manuseio e um bom número de réplicas. Após a oviposição, 18 estágios embrionários foram determinados durante os quais uréia foi o resíduo nitrogenado principal. Apesar do iguana ser o primeiro lagarto estudado, o padrão ureotélico é comum entre a maioria das espécies reptilianas estudadas até o momento. A casca pergaminácea permite que os ovos dobrem em massa devido à absorção de água, e o mecanismo pelo qual os embriões lidam com a diluição e osmolaridade resultante é um tema interessante para futuros trabalhos e comparações com espécies de cascas rígidas. Há evidência de desenvolvimento heterocrônico dos membros e o desenvolvimento de iguana é similar ao do lagarto Anolis sagrei, também do clado Iguania. Mais estudos de desenvolvimento de lagartos são necessários e a utilização de critérios morfológicos similares para facilitar a comparação de eventos embrionários.
A Table of embryonic stages can be used to detect similarities and differences in developmental features between groups and as a tool for studies based on embryonic phase. In this study, eggs of the lizard Iguana iguana were used to elaborate a staging table and to determine the nitrogen excretion pattern during the development. Iguana is a convenient model for having a large clutch of large eggs, allowing an easy handling and a good number of replicates. After oviposition embryonic stages were determined during which urea was the main nitrogen waste. Although iguana is the first lizard studied, the ureotelic pattern is common among the majority of reptilian species so far studied The pergaminaceous shell allows that the eggs double in mass due to water absorption, and the mechanism and how the egg deals with dilution and resultant osmolarity is an interesting issue for future works and comparisons with species of rigid eggshells. There is evidence of heterocronic development of the limbs and the development of iguana is similar to the lizard Anolis sagrei, also from the clade Iguania. Further studies on lizard evelopment are required and the use of similar morphological approach to facilitate comparisons of embryonic events
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10

Van, den Worm Johan H. "The comparative cranial osteology of the South African Lacertilia (reptilia: Squamata)." Thesis, Stellenbosch : Stellenbosch University, 1998. http://hdl.handle.net/10019.1/70379.

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Thesis (MSc)--Stellenbosch University, 1998
Stellenbosch University. Faculty of Science. Dept. of Botany & Zoology.
ENGLISH ABSTRACT: There has been a long-standing need to systematically analyze and classify South African fossil Lacertilia. Although extensive assemblages of fossil lizard and amphibian material from Langebaan on the West Coast and elsewhere exist in museum collections, the fragmentary nature of the material has largely prevented in-depth analyses and identification. In this comparative study the skulls and lower jaws of 7 lizard genera, representing the six extant South African families, were disassembled and the bones analyzed individually. The aim was to compile a comparative database of each bone against which current and future fossil finds could be matched. Detailed descriptions of the isolated elements were given. The results showed that despite some intra-generic variation, unique structural differences do exist in individual bones which may be utilized in the taxonomic assessment of fragmentary fossil material.
AFRIKAANSE OPSOMMING: Daar bestaan lank reeds 'n behoefte vir die sistematiese analise en klassifisering van fossielmateriaal van Suid-Afrikaanse Lacertilia. Alhoewel uitgebreide versamelings van akkedis- en amfibier-fossiele van Langebaan aan die Weskus en elders in museums bestaan, het die fragmentariese aard van die materiaal grootliks diepgaande analises en identifikasie belemmer In hierdie vergelykende studie is die skedels en onderkake van 7 akkedisgenera, wat die ses resente Suid-Afrikaanse families verteenwoordig, gedisartikuleer en elke been individueel geanaliseer. Die doel was om 'n vergelykende databasis van elke been saam te stel waarmee huidige en toekomstige fossielvondse vergelyk kan word. Gedetaileerde beskrywings van die ge'isoleerde elemente word gegee. Die resultate toon dat desondanks 'n mate van intra-generiese variasie, unieke strukturele verskille tussen individuele bene weI bestaan en dat hierdie verskille gebruik kan word om fossielfragmente taksonomies te analiseer.
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Books on the topic "Squamate Reptiles"

1

Mahler, D. Luke. The palatal dentition in squamate reptiles: Morphology, development, attachment, and replacement. Chicago, Ill: Field Museum of Natural History, 2006.

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Etheridge, Richard. A review of the South American lizard genera Urostrophus and Anisolepis (Squamata: Iguania: Polychridae). Cambridge, Mass: Harvard University, 1991.

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Braulio, Orejas-Miranda, Donoso-Barros Roberto, and Vanzolini P. E, eds. Catalogue of the neotropical squamata. Washington, D.C: Smithsonian Institution Press, 1986.

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1929-, Etheridge Richard Emmett, ed. A Phylogenetic analysis and taxonomy of iguanian lizards (Reptilia, Squamata). Lawrence, Kan: University of Kansas, 1989.

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Peters, Mike G. Life-size amphibians and reptiles of southern Ontario: Orders, Anura, Caudata, Squamata and Testudines. [Guelph, Ont: M.G. Peters], 2004.

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Hembree, Daniel I. Phylogenetic revision of Rhineuridae (Reptilia: Squamata: Amphisbaenia) from the Eocene to Miocene of North America. Lawrence, Kan: The University of Kansas, 2007.

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Christian, Andreas. Zur Biomechanik der Lokomotion vierfüssiger Reptilien (besonders der Squamata). Frankfurt a.M: Senckenbergische Naturforschende Gesellschaft, 1995.

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Nussbaum, Ronald A. Systematic revision of the genus Paroedura Günther (Reptilia: Squamata: Gekkonidae): With the description of five new species. Ann Arbor: Museum of Zoology, University of Michigan, 2000.

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Lang, Mathias. Phylogenetic and biogeographic patterns of basiliscine iguanians: Reptilia, Squamata, "Iguanidae". Bonn: Zoologisches Forschungsinstitut und Museum Alexander Koenig, 1989.

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A comparative anatomy of the neck region in lizards: A research study. [Victoria, B.C.]: Trafford Pub., 2007.

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Book chapters on the topic "Squamate Reptiles"

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Blain, Hugues-Alexandre. "Amphibians and Squamate Reptiles from Azokh 1." In Azokh Cave and the Transcaucasian Corridor, 191–210. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-24924-7_9.

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Rage, Jean-Claude, Guntupalli V. R. Prasad, Omkar Verma, Ashu Khosla, and Varun Parmar. "Anuran Lissamphibian and Squamate Reptiles from the Upper Cretaceous (Maastrichtian) Deccan Intertrappean Sites in Central India, with a Review of Lissamphibian and Squamate Diversity in the Northward Drifting Indian Plate." In Biological Consequences of Plate Tectonics, 99–121. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-49753-8_6.

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Shaney, Kyle J., Daren C. Card, Drew R. Schield, Robert P. Ruggiero, David D. Pollock, Stephen P. Mackessy, and Todd A. Castoe. "Squamate Reptile Genomics and Evolution." In Toxinology, 1–18. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6649-5_34-2.

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Shaney, Kyle J., Daren C. Card, Drew R. Schield, Robert P. Ruggiero, David D. Pollock, Stephen P. Mackessy, and Todd A. Castoe. "Squamate Reptile Genomics and Evolution." In Venom Genomics and Proteomics, 29–49. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6416-3_34.

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Francisco, Luiz Roberto, Kathleen Fernandes Grego, and Margarita Mas. "Class Reptilia, Order Squamata (Ophidia): Snakes." In Biology, Medicine, and Surgery of South American Wild Animals, 40–50. Ames, Iowa, USA: Iowa State University Press, 2008. http://dx.doi.org/10.1002/9780470376980.ch5.

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Molina, Flavio de Barros, and Teresa L. Lightfoot. "Class Reptilia, Order Squamata, (Lizards): Iguanas, Tegus." In Biology, Medicine, and Surgery of South American Wild Animals, 31–39. Ames, Iowa, USA: Iowa State University Press, 2008. http://dx.doi.org/10.1002/9780470376980.ch4.

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"Squamate Reptiles (Squamata)." In Field Guide to Amphibians and Reptiles of the San Diego Region, 121. University of California Press, 2006. http://dx.doi.org/10.1525/9780520939035-014.

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"Cues for Reproduction in Squamate Reptiles." In Reproductive Biology and Phylogeny of Lizards and Tuatara, 121–55. CRC Press, 2014. http://dx.doi.org/10.1201/b17961-8.

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"Filtering Texture From Biological Surfaces to Technological Surfaces." In Inspiration and Design for Bio-Inspired Surfaces in Tribology, 223–58. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-1647-8.ch007.

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This chapter discusses the impact of absence of a holistic surface-design methodology in the technological realm. The authors show that manifesting designs that merge function, form, and topography to achieve lean performance is currently a bottleneck in the field of tribology. The presented material shows that merging function and topography, while not matured within the realm of manmade surfaces, is advanced in natural designs, especially within the scaled reptiles (Squamata). This prompts many engineers to scour biological analogues for design alternatives. However, the problem of evaluating the viability of a natural surface and judging its suitability for a technological application is frequently encountered. The chapter adresses this problem through a detailed case study that involves extracting metrological information for snakes that engage in rectilinear locomotion.
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Striedter, Georg F., and R. Glenn Northcutt. "The Conquest of Land." In Brains Through Time, 261–336. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780195125689.003.0005.

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Early amniotes evolved water-resistant skin and eggs, which allowed them to live and reproduce entirely on land. Roughly 300 million years ago, amniotes split into synapsids (including mammals) and sauropsids (“reptiles” and birds). The sauropsid lineage includes squamates (lizards and snakes), turtles, and archosaurs (crocodilians and dinosaurs, including birds). Tympanic ears and more complex auditory systems evolved at least twice within the various amniote lineages. Amniotes also evolved a separate vomeronasal epithelium and more diverse modes of locomotion and feeding. Brain size relative to body size increased in early amniotes and then increased further in several amniote lineages, notably mammals and birds. The most enlarged regions were the cerebellum and the telencephalon. Within the telencephalon, sauropsids enlarged mainly the ventral pallium, whereas mammals enlarged the dorsal pallium (aka neocortex). Although these regions are not homologous to one another, they both receive unimodal auditory, visual, and somatosensory input from the thalamus.
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Conference papers on the topic "Squamate Reptiles"

1

Musthak, Bachelors, Adham, Dhabiya Al-kubaisi, Wadha Almarri, Ghizlane Bendriss, Aurora M. Castilla, and Kuei-chiu Chen. "Dna Barcoding Of Lizards (reptilia, Squamata) Of Qatar." In Qatar Foundation Annual Research Conference Proceedings. Hamad bin Khalifa University Press (HBKU Press), 2014. http://dx.doi.org/10.5339/qfarc.2014.eesp0760.

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Yudha, Donan Satria, Rury Eprilurahman, Edwina Prastiwi Sri Rizky, Wiwit Feri Wijiastuti, and Muhammad Anis Nasrullah. "Snakes and lizards (Reptilia: Squamata) of Gadjah Wong River area, Province of Daerah Istimewa Yogyakarta." In INVENTING PROSPEROUS FUTURE THROUGH BIOLOGICAL RESEARCH AND TROPICAL BIODIVERSITY MANAGEMENT: Proceedings of the 5th International Conference on Biological Science. Author(s), 2018. http://dx.doi.org/10.1063/1.5050110.

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Yudha, Donan Satria, Rury Eprilurahman, Rianjani Pratiwi, Iman Akbar Muhtianda, Aisyah Arimbi, and Hastin Ambar Asti. "Snakes and lizards (Reptilia: Squamata) of the Opak River area, province of Daerah Istimewa Yogyakarta, Indonesia." In TOWARDS THE SUSTAINABLE USE OF BIODIVERSITY IN A CHANGING ENVIRONMENT: FROM BASIC TO APPLIED RESEARCH: Proceeding of the 4th International Conference on Biological Science. Author(s), 2016. http://dx.doi.org/10.1063/1.4953487.

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