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Journal articles on the topic 'Chelicerate evolution'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

van der Hammen, L. "Functional morphology and affinities of extant Chelicerata in evolutionary perspective." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 76, no. 2-3 (1985): 137–46. http://dx.doi.org/10.1017/s0263593300010403.

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ABSTRACTA survey is given of the functional morphology of extant Chelicerata with special reference to segmentation of the body, segmentation and articulation of the legs, coxal glands, mouthparts and ingestion, respiratory organs, sperm transfer, and development. This is followed by a discussion of primitive types, evolution and diversity, the transition from aquatic to terrestrial life, and the affinities of extant chelicerate groups.

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2

Rehm, Peter, Christian Pick, Janus Borner, Jürgen Markl, and Thorsten Burmester. "The diversity and evolution of chelicerate hemocyanins." BMC Evolutionary Biology 12, no. 1 (2012): 19. http://dx.doi.org/10.1186/1471-2148-12-19.

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3

Ballesteros, Jesús A., and Prashant P. Sharma. "A Critical Appraisal of the Placement of Xiphosura (Chelicerata) with Account of Known Sources of Phylogenetic Error." Systematic Biology 68, no. 6 (2019): 896–917. http://dx.doi.org/10.1093/sysbio/syz011.

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AbstractHorseshoe crabs (Xiphosura) are traditionally regarded as sister group to the clade of terrestrial chelicerates (Arachnida). This hypothesis has been challenged by recent phylogenomic analyses, but the non-monophyly of Arachnida has consistently been disregarded as artifactual. We re-evaluated the placement of Xiphosura among chelicerates using the most complete phylogenetic data set to date, expanding outgroup sampling, and including data from whole genome sequencing projects. In spite of uncertainty in the placement of some arachnid clades, all analyses show Xiphosura consistently ne

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4

Wheeler, Ward C., and Cheryl Y. Hayashi. "The Phylogeny of the Extant Chelicerate Orders." Cladistics 14, no. 2 (1998): 173–92. http://dx.doi.org/10.1111/j.1096-0031.1998.tb00331.x.

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5

Van Leeuwen, Thomas, and Wannes Dermauw. "The Molecular Evolution of Xenobiotic Metabolism and Resistance in Chelicerate Mites." Annual Review of Entomology 61, no. 1 (2016): 475–98. http://dx.doi.org/10.1146/annurev-ento-010715-023907.

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6

Abzhanov, Arhat, Aleksandar Popadic, and Thomas C. Kaufman. "Chelicerate Hox genes and the homology of arthropod segments." Evolution and Development 1, no. 2 (1999): 77–89. http://dx.doi.org/10.1046/j.1525-142x.1999.99014.x.

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7

CHEN, JUNYUAN, DIETER WALOSZEK, and ANDREAS MAAS. "A new ‘great-appendage’ arthropod from the Lower Cambrian of China and homology of chelicerate chelicerae and raptorial antero-ventral appendages." Lethaia 37, no. 1 (2004): 3–20. http://dx.doi.org/10.1080/00241160410004764.

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8

Cartwright, Paulyn, Matthew Dick, and Leo W. Buss. "HOM/Hox Type Homeoboxes in the Chelicerate Limulus polyphemus." Molecular Phylogenetics and Evolution 2, no. 3 (1993): 185–92. http://dx.doi.org/10.1006/mpev.1993.1019.

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9

CHETVERIKOV, P.E. "EVOLUTIONARY PLASTICITY OF HIGHLY SPECIALIZED ORGANISMS: EVOLUTION OF ERIOPHYOID MITES (ACARIFORMES: ERIOPHYOIDEA) ON PLANTS." Acta entomologica serbica 20, no. 1 (2015): 151–61. https://doi.org/10.5281/zenodo.44649.

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Eriophyoids are highly specialized plant-feeding acarifom mites. As a result of miniaturization and adaptation to phytoparasitism they lacked III and IV pairs of legs and acquired elongated vermiform body, unique structure of gnathosoma and peculiar anatomy. Despite the high degree of specialization eriophyoid mites demonstrate remarkable evolutionary plasticity which manifests itself in numerous morphoilogical reversia, parallelisms and modifications associated with occupying of a variety of niches, processes of gall formation, transitions to new groups of hosts and various adaptations to cli

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10

Veenstra, Jan A. "Neuropeptide evolution: Chelicerate neurohormone and neuropeptide genes may reflect one or more whole genome duplications." General and Comparative Endocrinology 229 (April 2016): 41–55. http://dx.doi.org/10.1016/j.ygcen.2015.11.019.

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11

Starck, J. Matthias, Jelena Belojević, Jason Brozio, and Lisa Mehnert. "Comparative anatomy of the rostrosoma of Solifugae, Pseudoscorpiones and Acari." Zoomorphology 141, no. 1 (2022): 57–80. http://dx.doi.org/10.1007/s00435-021-00551-3.

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AbstractWe compare the microscopic anatomy of the mouthparts of representative species of Solifugae, Pseudoscorpiones and Parasitiformes (Acari). Specifically, we focus on the epistome, the labrum, the lateral lips (= endites of the pedipalpal coxae) and the musculature of the pharyngeal suction pump. We provide evidence that the labrum is reduced in Solifugae, but present and functional in Pseudoscorpiones and Acari. The epistome constitutes the entire dorsal face of the rostrosoma in Solifugae, but is internalized into the prosoma in Pseudoscorpiones. In Acari, the epistome shows an ancestra

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12

Klok, C. Jaco, Richard D. Mercer, and Steven L. Chown. "Discontinuous gas-exchange in centipedes and its convergent evolution in tracheated arthropods." Journal of Experimental Biology 205, no. 7 (2002): 1019–29. http://dx.doi.org/10.1242/jeb.205.7.1019.

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SUMMARY We have examined the gas-exchange characteristics of five southern African centipede species from three orders. Two scolopendromorph species exhibit discontinuous gas-exchange cycles (DGCs) identical to those recorded for several insect and chelicerate species. Another scolopendromorph and a lithobiomorph species exhibit weak periodic patterns, and a scutigermorph species shows continuous gas exchange. A crucial component for DGCs in tracheated arthropods is the presence of occludible spiracles. However, on the basis of studies of temperate centipedes, most recent invertebrate biology

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13

Powell, Erin C., Christina J. Painting, Anthony J. Hickey, and Gregory I. Holwell. "Defining an intrasexual male weapon polymorphism in a New Zealand harvestman (Opiliones: Neopilionidae) using traditional and geometric morphometrics." Biological Journal of the Linnean Society 130, no. 2 (2020): 395–409. http://dx.doi.org/10.1093/biolinnean/blaa040.

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Abstract In many species, competition for mates has led to exaggerated male sexually-selected traits. Sexually-selected male weapons are used in male-male combat and include structures like horns, antlers and enlarged teeth. Weapons often vary intraspecifically in size, resulting in either a continuum of weapon sizes or in discrete male polymorphisms. More rarely, complex weapon polymorphisms can also include variation in weapon shape; however, these are difficult to quantify. Here we first use traditional linear morphometrics to describe a weapon trimorphism in the endemic New Zealand harvest

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14

Gainett, Guilherme, Vanessa L. González, Jesús A. Ballesteros, et al. "The genome of a daddy-long-legs (Opiliones) illuminates the evolution of arachnid appendages." Proceedings of the Royal Society B: Biological Sciences 288, no. 1956 (2021): 20211168. http://dx.doi.org/10.1098/rspb.2021.1168.

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Chelicerate arthropods exhibit dynamic genome evolution, with ancient whole-genome duplication (WGD) events affecting several orders. Yet, genomes remain unavailable for a number of poorly studied orders, such as Opiliones (daddy-long-legs), which has hindered comparative study. We assembled the first harvestman draft genome for the species Phalangium opilio , which bears elongate, prehensile appendages, made possible by numerous distal articles called tarsomeres. Here, we show that the genome of P. opilio exhibits a single Hox cluster and no evidence of WGD. To investigate the developmental g

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15

Racheboeuf, Patrick R., Jean Vannier, and Lyall I. Anderson. "A New Three-Dimensionally Preserved Xiphosuran Chelicerate from the Montceau-Les-Mines Lagerstatte (Carboniferous, France)." Palaeontology 45, no. 1 (2002): 125–47. http://dx.doi.org/10.1111/1475-4983.00230.

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16

Schoenemann, Brigitte. "Trilobite Eyes and Their Evolution." Arthropoda 3, no. 1 (2025): 3. https://doi.org/10.3390/arthropoda3010003.

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Trilobites, as typical euarthropods, possess compound eyes. In 1901, Lindström was the first to describe them in detail; on the one hand, we reconsider his descriptions of the different modes of trilobite eyes; on the other hand, we expand this by compiling the observations that have been possible in recent years. There are two, perhaps three kinds of trilobite compound eyes. The first are the primordial holochroal eyes, which are actually apposition compound eyes, similar to those of many modern diurnal crustaceans and insects. The abathochroal eyes, often referred to as the second form, are

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17

Giribet, Gonzalo, Gregory D. Edgecombe, Ward C. Wheeler, and Courtney Babbitt. "Phylogeny and Systematic Position of Opiliones: A Combined Analysis of Chelicerate Relationships Using Morphological and Molecular Data1." Cladistics 18, no. 1 (2002): 5–70. http://dx.doi.org/10.1111/j.1096-0031.2002.tb00140.x.

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18

Giribet, G. "Phylogeny and Systematic Position of Opiliones: A Combined Analysis of Chelicerate Relationships Using Morphological and Molecular Data." Cladistics 18, no. 1 (2002): 5–70. http://dx.doi.org/10.1006/clad.2001.0185.

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19

Jago, James B., Diego C. García‐Bellido, and James G. Gehling. "An early C ambrian chelicerate from the E mu B ay S hale, S outh A ustralia." Palaeontology 59, no. 4 (2016): 549–62. http://dx.doi.org/10.1111/pala.12243.

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20

Bowman, Clive E. "Feeding design in free-living mesostigmatid chelicerae (Acari: Anactinotrichida)." Experimental and Applied Acarology 84, no. 1 (2021): 1–119. http://dx.doi.org/10.1007/s10493-021-00612-8.

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AbstractA model based upon mechanics is used in a re-analysis of historical acarine morphological work augmented by an extra seven zoophagous mesostigmatid species. This review shows that predatory mesostigmatids do have cheliceral designs with clear rational purposes. Almost invariably within an overall body size class, the switch in predatory style from a worm-like prey feeding (‘crushing/mashing’ kill) functional group to a micro-arthropod feeding (‘active prey cutting/slicing/slashing' kill) functional group is matched by: an increased cheliceral reach, a bigger chelal gape, a larger morph

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21

McCoy, Victoria E., James C. Lamsdell, Markus Poschmann, Ross P. Anderson, and Derek E. G. Briggs. "All the better to see you with: eyes and claws reveal the evolution of divergent ecological roles in giant pterygotid eurypterids." Biology Letters 11, no. 8 (2015): 20150564. http://dx.doi.org/10.1098/rsbl.2015.0564.

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Pterygotid eurypterids have traditionally been interpreted as active, high-level, visual predators; however, recent studies of the visual system and cheliceral morphology of the pterygotid Acutiramus contradict this interpretation. Here, we report similar analyses of the pterygotids Erettopterus, Jaekelopterus and Pterygotus , and the pterygotid sister taxon Slimonia . Representative species of all these genera have more acute vision than A. cummingsi . The visual systems of Jaekelopterus rhenaniae and Pterygotus anglicus are comparable to that of modern predatory arthropods. All species of Ja

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22

Beall, Bret S., and Conrad C. Labandeira. "Macroevolutionary Patterns of the Chelicerata and Tracheata." Short Courses in Paleontology 3 (1990): 257–84. http://dx.doi.org/10.1017/s2475263000001823.

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Most paleontological textbooks deal with tracheates and chelicerates in only a cursory way because of their putatively poor fossil record. However, recent investigations into the paleobiology of these groups reveal that the fossil record is not only more extensive than previously assumed, but provides a wealth of information regarding both broad and detailed patterns of evolution of the two most diverse subphyla on the planet. Tracheata, including insects, entognaths and the various myriapod groups, are the most diverse subphylum. Insects alone are the most diverse class of animals known, outn

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23

Taylor, Christopher. "Australiscutum, a new genus of Monoscutidae (Arachnida: Opiliones) from eastern Australia, with the first record of asymmetrical chelicerae in Opiliones." Insect Systematics & Evolution 40, no. 4 (2009): 319–32. http://dx.doi.org/10.1163/187631209x458367.

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AbstractA new genus of Monoscutidae (Arachnida: Opiliones), Australiscutum, containing three new species, A. hunti (type species), A. graciliforceps and A. triplodaemon, is described from Queensland and New South Wales, Australia. Australiscutum triplodaemon differs from all other Opiliones described to date in possessing noticeably asymmetrical chelicerae, with the right chelicera much larger than the left.

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24

MOORE, RACHEL, and SIMON BRADDY. "A glyptocystitid cystoid affinity for the putative stem group chelicerate (Arthropoda: Aglaspidida or Xiphosura) Lemoneites from the Ordovician of Texas, USA." Lethaia 38, no. 3 (2005): 293–96. http://dx.doi.org/10.1080/00241160510013277.

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25

Qu, Zhe, William G. Bendena, Wenyan Nong, et al. "MicroRNAs regulate the sesquiterpenoid hormonal pathway in Drosophila and other arthropods." Proceedings of the Royal Society B: Biological Sciences 284, no. 1869 (2017): 20171827. http://dx.doi.org/10.1098/rspb.2017.1827.

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Arthropods comprise the majority of all described animal species, and understanding their evolution is a central question in biology. Their developmental processes are under the precise control of distinct hormonal regulators, including the sesquiterpenoids juvenile hormone (JH) and methyl farnesoate. The control of the synthesis and mode of action of these hormones played important roles in the evolution of arthropods and their adaptation to diverse habitats. However, the precise roles of non-coding RNAs, such as microRNAs (miRNAs), controlling arthropod hormonal pathways are unknown. Here, w

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26

Averdam, Anne, Jurgen Markl, and Thorsten Burmester. "Subunit sequences of the 4 x 6-mer hemocyanin from the golden orb-web spider, Nephila inaurata. Intramolecular evolution of the chelicerate hemocyanin subunits." European Journal of Biochemistry 270, no. 16 (2003): 3432–39. http://dx.doi.org/10.1046/j.1432-1033.2003.03730.x.

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27

Sharma, Prashant P., Evelyn E. Schwager, Cassandra G. Extavour, and Gonzalo Giribet. "Evolution of the chelicera: adachshunddomain is retained in the deutocerebral appendage of Opiliones (Arthropoda, Chelicerata)." Evolution & Development 14, no. 6 (2012): 522–33. http://dx.doi.org/10.1111/ede.12005.

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28

Willemart, Rodrigo H., Jean-Pierre Farine, Alfredo V. Peretti, and Pedro Gnaspini. "Behavioral roles of the sexually dimorphic structures in the male harvestman, Phalangium opilio (Opiliones, Phalangiidae)." Canadian Journal of Zoology 84, no. 12 (2006): 1763–74. http://dx.doi.org/10.1139/z06-173.

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In various animal species, male sexual dimorphic characters may be used during intrasexual contests as ornaments to attract females, or to hold them before, during, or after copulation. In the well-known harvestman, Phalangium opilio L., 1758, the behavioral functions of these male sexually dimorphic structures have never been studied in detail. Therefore, in addition to a morphometric study, 21 male contests and 43 sexual interactions were analyzed. Our observations revealed that during contests, the male cheliceral horns form a surface by which the contestants use to push each other face-to-

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29

Noah, Katherine E., Jiasheng Hao, Luyan Li, et al. "Major Revisions in Arthropod Phylogeny Through Improved Supermatrix, With Support for Two Possible Waves of Land Invasion by Chelicerates." Evolutionary Bioinformatics 16 (January 2020): 117693432090373. http://dx.doi.org/10.1177/1176934320903735.

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Deep phylogeny involving arthropod lineages is difficult to recover because the erosion of phylogenetic signals over time leads to unreliable multiple sequence alignment (MSA) and subsequent phylogenetic reconstruction. One way to alleviate the problem is to assemble a large number of gene sequences to compensate for the weakness in each individual gene. Such an approach has led to many robustly supported but contradictory phylogenies. A close examination shows that the supermatrix approach often suffers from two shortcomings. The first is that MSA is rarely checked for reliability and, as wil

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30

Wood, Hannah M. "Morphology and performance of the ‘trap-jaw’ cheliceral strikes in spiders (Araneae, Mecysmaucheniidae)." Journal of Experimental Biology 223, no. 14 (2020): jeb219899. http://dx.doi.org/10.1242/jeb.219899.

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ABSTRACTMecysmaucheniidae spiders have evolved ultra-fast cheliceral strikes 4 times independently. The mechanism for producing these high-speed strikes is likely due to a latch/spring system that allows for stored energy to be rapidly released. This study examined two different sister lineages: Zearchaea has ultra-fast cheliceral strikes and Aotearoa, based on external morphology of the clypeus, is hypothesized to have slower strikes. Using high-speed videography, I first gathered kinematic data on each taxon. Then, using histology and data from micro-computed tomography scanning, I examined

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31

Rioja, Cristina, Vladimir Zhurov, Kristie Bruinsma, Miodrag Grbic, and Vojislava Grbic. "Plant-Herbivore Interactions: A Case of an Extreme Generalist, the Two-Spotted Spider Mite Tetranychus urticae." Molecular Plant-Microbe Interactions® 30, no. 12 (2017): 935–45. http://dx.doi.org/10.1094/mpmi-07-17-0168-cr.

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Plant-herbivore interactions evolved over long periods of time, resulting in an elaborate arms race between interacting species. While specialist herbivores evolved specific strategies to cope with the defenses of a limited number of hosts, our understanding of how generalist herbivores deal with the defenses of a plethora of diverse host plants is largely unknown. Understanding the interaction between a plant host and a generalist herbivore requires an understanding of the plant’s mechanisms aimed at defending itself and the herbivore’s mechanisms intended to counteract diverse defenses. In t

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32

RHEIMS, CRISTINA ANNE. "A new genus of huntsman spiders from the Neotropical region (Araneae: Sparassidae: Heteropodinae)." Zootaxa 2650, no. 1 (2010): 33. http://dx.doi.org/10.11646/zootaxa.2650.1.3.

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Guadana gen. nov. is proposed to include six new species: Guadana manauara sp. nov., G. urucu sp. nov. and G. neblina sp. nov. from Brazil; G. quillu sp. nov., from Ecuador; and G. panguana sp. nov. and G. tambopata sp. nov. from Peru. The genus is distinguished from the remaining Neotropical Sparassidae by the presence of a single row of intermarginal denticles, occupying most of the cheliceral grove, a sickle-shaped dorsal tegular projection in the male palps and epigynal ledges in the female epigynum. It is placed in the subfamily Heteropodinae Thorell due to the presence of intermarginal d

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DE LEÓN-ESPINOSA, ANGEL, JESUS ANGEL DE LEÓN-GONZALEZ, and JAIME GÓMEZ-GUTIÉRREZ. "Pycnogonids from marine docks located along the west coast of the Gulf of California, Mexico." Zootaxa 4938, no. 2 (2021): 151–95. http://dx.doi.org/10.11646/zootaxa.4938.2.1.

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Sea spiders (Class Pycnogonida Latreille, 1810) are chelicerate arthropods, with an extraordinarily reduced body armed with eight to twelve elongated legs. A literature review of taxonomic and ecological studies of pycnogonids from Mexico identified 49 nominal species (~3.6% out of 1,335 species described worldwide). This low species richness is likely caused by limited taxonomic research and intermittent sampling and research efforts initially carried out by foreign scientists (1893–1996) and later by Mexican scientists. The present study investigates the latitudinal gradient of species richn

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34

Sharma, Prashant P., Evelyn E. Schwager, Cassandra G. Extavour, and Ward C. Wheeler. "Hox gene duplications correlate with posterior heteronomy in scorpions." Proceedings of the Royal Society B: Biological Sciences 281, no. 1792 (2014): 20140661. http://dx.doi.org/10.1098/rspb.2014.0661.

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The evolutionary success of the largest animal phylum, Arthropoda, has been attributed to tagmatization, the coordinated evolution of adjacent metameres to form morphologically and functionally distinct segmental regions called tagmata. Specification of regional identity is regulated by the Hox genes, of which 10 are inferred to be present in the ancestor of arthropods. With six different posterior segmental identities divided into two tagmata, the bauplan of scorpions is the most heteronomous within Chelicerata. Expression domains of the anterior eight Hox genes are conserved in previously su

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35

Lukeneder, Petra, and Alexander Lukeneder. "Mineralized belemnoid cephalic cartilage from the late Triassic Polzberg Konservat-Lagerstätte (Austria)." PLOS ONE 17, no. 4 (2022): e0264595. http://dx.doi.org/10.1371/journal.pone.0264595.

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Although hyaline cartilage is widely distributed in various invertebrate groups such as sabellid polychaetes, molluscs (cephalopods, gastropods) and a chelicerate arthropod group (horseshoe crabs), the enigmatic relationship and distribution of cartilage in taxonomic groups remains to be explained. It can be interpreted as a convergent trait in animal evolution and thus does not seem to be a vertebrate invention. Due to the poor fossil record of cartilaginous structures, occurrences of mineralized fossil cartilages are important for evolutionary biology and paleontology. Although the biochemic

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36

Kontschán, Jeno. "Ivoria taiensis gen. nov., sp. nov., a remarkable new mite genus from West Africa (Acari: Mesostigmata: Urodinychidae)." Systematic and Applied Acarology 24, no. 6 (2019): 1063–70. http://dx.doi.org/10.11158/saa.24.6.9.

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A new monotypic genus, Ivoria taiensis gen. nov., sp. nov. (Mesostigmata: Uropodina: Uropodinychidae) is described on the basis of seven females collected in soil samples from Ivory Coast. The new genus has large and robust chelicerae, but it differs from the other Uropodina genera having similar chelicerae in several characters, which are presented in a comparative table. The new genus is placed in the family Urodinychidae based on its long setae h1, chelicerae with an internal sclerotized node, fixed digit of chelicerae apically smooth and devoid of apical processes, corniculi smooth.

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Doker, Ismail, Kamil Karut, Mete M. Karaca, Elena Cargnus, and Cengiz Kazak. "Internal Transcribed Spacer (ITS) sequences of some Kampimodromus (Acari: Phytoseiidae) species: Is Kampimodromus ragusai a valid species or a synonym of Kampimodromus aberrans?" Systematic and Applied Acarology 23, no. 11 (2018): 2237. http://dx.doi.org/10.11158/saa.23.11.15.

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Taxonomy of the most important predatory mite family Phytoseiidae (Acari: Mesostigmata) is essentially based on morphological observations, and only a few studies use molecular approaches. In some cases, tiny morphological differences (e.g. number of teeth on cheliceral digits, presence of dorsal solenostomes) should be observed for accurate species identification. Kampimodromus ragusai Swirski & Amitai, originally described from Israel, was suspected as a junior synonym of K. aberrans (Oudemans) in an earlier study. The only difference between these two species is the presence or absence

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CASAS, CRISTIAN M., and CRISTINA A. RHEIMS. "Nativus gen. nov., a new huntsman spider genus from South America (Araneae: Sparassidae: Heteropodinae)." Zootaxa 5360, no. 1 (2023): 1–43. http://dx.doi.org/10.11646/zootaxa.5360.1.1.

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In this paper, the new genus, Nativus gen. nov. is proposed to include the type species, Nativus tupana sp. nov. (♂♀) from Brazil and nine new species: N. carare sp. nov. (♂), N. hazzii sp. nov. (♂♀), N. janai sp. nov. (♂), N. nocaima sp. nov. (♂♀), N. tawu sp. nov. (♂♀) and N. yurupari sp. nov. (♂♀) from Colombia, N. juruti sp. nov. (♂) and N. mariua sp. nov. (♂♀) from Brazil, and N. napo sp. nov. (♂♀) from Peru. The genus is placed in the subfamily Heteropodinae due to the presence of intermarginal denticles on the chelicerae, a long-toothed female palpal claw, two recurved eye rows with med

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39

van der Hammen, L. "On some aspects of parallel evolution in Chelicerata." Acta Biotheoretica 35, no. 1-2 (1986): 15–37. http://dx.doi.org/10.1007/bf00118365.

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40

Dunlop, Jason A. "Miniaturisation in Chelicerata." Arthropod Structure & Development 48 (January 2019): 20–34. http://dx.doi.org/10.1016/j.asd.2018.10.002.

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41

Walter, David Evans, and Evert E. Lindquist. "Life history and behavior of mites in the genus Lasioseius (Acari: Mesostigmata: Ascidae) from grassland soils in Colorado, with taxonomic notes and description of a new species." Canadian Journal of Zoology 67, no. 11 (1989): 2797–813. http://dx.doi.org/10.1139/z89-396.

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Lasioseius berlesei (Oudemans), Lasioseius youcefi Athias-Henriot, Lasioseius kinikinik n.sp., and Lasioseius confusus Evans were collected from grassland soils in Colorado. Lasioseius berlesei and L. youcefi are known only from the female, and for the first time in an ascid mite, we experimentally demonstrate that they reproduce by thelytokous parthenogenesis. Both species are omnivores that will feed on fungi and animal prey, and they share a multidenticulate ridge apposed to a groove on the paraxial faces of the chelicerae which appears to function as a mashing and filtering mechanism durin

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Zhou, Fengyan, Guozheng Cao, Songjun Dai, et al. "Chelicerata sDscam isoforms combine homophilic specificities to define unique cell recognition." Proceedings of the National Academy of Sciences 117, no. 40 (2020): 24813–24. http://dx.doi.org/10.1073/pnas.1921983117.

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Thousands of Down syndrome cell adhesion molecule (Dscam1) isoforms and ∼60 clustered protocadhrein (cPcdh) proteins are required for establishing neural circuits in insects and vertebrates, respectively. The strict homophilic specificity exhibited by these proteins has been extensively studied and is thought to be critical for their function in neuronal self-avoidance. In contrast, significantly less is known about the Dscam1-related family of ∼100 shortened Dscam (sDscam) proteins in Chelicerata. We report that Chelicerata sDscamα and some sDscamβ protein trans interactions are strictly homo

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Harvey, MS. "The Schizomida (Chelicerata) of Australia." Invertebrate Systematics 6, no. 1 (1992): 77. http://dx.doi.org/10.1071/it9920077.

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A revision of the Schizomida known to occur in Australia reveals five new genera (Draculoides, Apozomus, Bamazomus, Notozomus and Julattenius) and 25 species, 24 of which are newly described: Draculoides (type and only species, Schizomus vinei Harvey); Apozomus (type species A. watsoni, and A. alligator, A. cactus, A. gunn, A. mainae, A. nob, A. pellew, A. radon, A. rupina, A. spec, A. weipa, A. weiri, A. woodwardi and A. yirrkala); Bamazomus (type species B. bamaga); Notozomus (type species N. aterpes, and N. daviesae, N. ingham, N. ker, N. monteithi, N. raveni and N. rentzi); and Julattenius

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Leite, Daniel J., and Alistair P. McGregor. "Arthropod evolution and development: recent insights from chelicerates and myriapods." Current Opinion in Genetics & Development 39 (August 2016): 93–100. http://dx.doi.org/10.1016/j.gde.2016.06.002.

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Tang, Victoria. "Non-aggressive competition between males of Srilankametrus yaleensis (Kovařík et al., 2019) (Scorpionidae), and other types of agonistic behavior observed in scorpions." Euscorpius 2023, no. 368 (2023): 1–17. https://doi.org/10.5281/zenodo.12788409.

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A peculiar intraspecific agonistic behavior involving a non-aggressive physical combat is reported between the adult males of <em>Srilankametrus yaleensis</em> (Kovařík et al., 2019) (Scorpionidae: Heterometrinae). The adult males were observed to resort to a ritualized and relatively gentle way for strength demonstration. The combat is characterized by lateral spreading of pedipalps, chelicerae-to-chelicerae collision, and entanglement of metasomal segments. This behavior is hereby considered a form of an intrasexual combat defined as the “arm-span competition”. It is

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Colgan, D. J., A. McLauchlan, G. D. F. Wilson, et al. "Histone H3 and U2 snRNA DNA sequences and arthropod molecular evolution." Australian Journal of Zoology 46, no. 5 (1998): 419. http://dx.doi.org/10.1071/zo98048.

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The range of DNA sequences used to study the interrelationships of the major arthropod groups (chelicerates, myriapods, hexapods and crustaceans) is limited. Here we investigate the value of two genes not previously employed in arthropod phylogenetics. Histone H3 data were collected for 31 species and small nuclear ribonucleic acid U2 data for 29 species. The sequences provided a total of 460 sites and 192 parsimony-informative characters. H3 analyses showed substantial codon usage bias, but had a low consistency index (0.26). Consistency indices were higher for the U2 data (0.49), suggesting

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Dunlop, Jason A., and James C. Lamsdell. "Segmentation and tagmosis in Chelicerata." Arthropod Structure & Development 46, no. 3 (2017): 395–418. http://dx.doi.org/10.1016/j.asd.2016.05.002.

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LABARQUE, FACUNDO M., and MARTÍN J. RAMÍREZ. "The placement of the spider genus Periegops and the phylogeny of Scytodoidea (Araneae: Araneomorphae)." Zootaxa 3312, no. 1 (2012): 1. http://dx.doi.org/10.11646/zootaxa.3312.1.1.

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The relationships of Scytodoidea, including the families Drymusidae, Periegopidae, Scytodidae and Sicariidae, have been con-tentious for a long time. Here we present a reviewed phylogenetic analysis of scytodoid spiders, emphasizing Periegops, theonly genus in the family Periegopidae. In our analysis the Scytodoidea are united by the fusion of the third abdominal entapo-physes into a median lobe, the presence of female palpal femoral thorns and associated cheliceral stridulatory ridges, a mem-branous lobe on the cheliceral promargin, and the loss of minor ampullate gland spigots. A basal split

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SOUZA, MAYSA F. V. R., RODRIGO L. FERREIRA, and LEONARDO S. CARVALHO. "A new species of the genus Gaucha Mello-Leitão, 1924 from Minas Gerais, Brazil (Solifugae, Mummuciidae)." Zootaxa 5061, no. 3 (2021): 559–72. http://dx.doi.org/10.11646/zootaxa.5061.3.9.

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A new sun-spider species of the ibirapemussu species-group of the genus Gaucha is described based on males and a female collected in Southeastern Brazil. The newly described species can be readily distinguished from its congeners by the reduction of the cheliceral fixed finger, distal tooth (FD), closely positioned and smaller than the medial tooth (FM); the presence of cheliceral fixed finger profondal subproximal (PFSP) and retrofondal submedial (RFSM) teeth; and by the cheliceral movable finger, medial tooth (MM) well developed, larger than submedial tooth (MSM) and smaller than proximal to

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TETLIE, O. ERIK, and DEREK E. G. BRIGGS. "The origin of pterygotid eurypterids (Chelicerata: Eurypterida)." Palaeontology 52, no. 5 (2009): 1141–48. http://dx.doi.org/10.1111/j.1475-4983.2009.00907.x.

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