Extinct genus of chelicerate
Reconstruction of Pasternakevia podolica
Pasternakevia is a genus of synziphosurine ,[ 1] a paraphyletic group of fossil chelicerate arthropods .[ 2] [ 3] Pasternakevia was regarded as part of the clade Planaterga .[ 2] [ 4] [ 5] [ 6] [ 3] [ 7] Fossils of the single and type species , P. podolica , have been discovered in deposits of the Silurian period in Podolia , Ukraine .[ 7] [ 2]
The prosoma of Pasternakevia covered by a smooth, semicircular carapace with rounded genal cornua (posterolateral corner of carapace).[ 1] Within the 10-segmented opisthosoma , tergite of the first segment is reduced and usually hidden under the preceding carapace, while the second one is significantly arched and well-developed.[ 1] All but the first tergite possess well-developed pleurae (lateral extension). A complete telson is yet to be discovered.[ 1]
^ a b c d Krzemiński, Wiesław; Krzemińska, Ewa; Wojciechowski, Dariusz (2010). "Silurian Synziphosurine Horseshoe Crab Pasternakevia Revisited" . Acta Palaeontologica Polonica . 55 (1): 133–139. doi :10.4202/app.2008.0074 . ISSN 0567-7920 .
^ a b c Lamsdell, James C. (2013). "Revised systematics of Palaeozoic 'horseshoe crabs' and the myth of monophyletic Xiphosura" . Zoological Journal of the Linnean Society . 167 (1): 1–27. doi :10.1111/j.1096-3642.2012.00874.x . ISSN 0024-4082 .
^ a b Bicknell, Russell D. C.; Pates, Stephen (2020). "Pictorial Atlas of Fossil and Extant Horseshoe Crabs, With Focus on Xiphosurida" . Frontiers in Earth Science . 8 : 98. Bibcode :2020FrEaS...8...98B . doi :10.3389/feart.2020.00098 . ISSN 2296-6463 .
^ Selden, Paul A.; Lamsdell, James C.; Qi, Liu (2015). "An unusual euchelicerate linking horseshoe crabs and eurypterids, from the Lower Devonian (Lochkovian) of Yunnan, China" . Zoologica Scripta . 44 (6): 645–652. doi :10.1111/zsc.12124 . ISSN 0300-3256 . S2CID 55264483 .
^ Lamsdell, James C.; Briggs, Derek E. G.; Liu, Huaibao P.; Witzke, Brian J.; McKay, Robert M. (2015). "A new Ordovician arthropod from the Winneshiek Lagerstätte of Iowa (USA) reveals the ground plan of eurypterids and chasmataspidids" . The Science of Nature . 102 (9–10): 63. Bibcode :2015SciNa.102...63L . doi :10.1007/s00114-015-1312-5 . ISSN 0028-1042 . PMID 26391849 . S2CID 8153035 .
^ Bicknell, Russell D. C.; Lustri, Lorenzo; Brougham, Tom (2019-12-01). "Revision of "Bellinurus" carteri (Chelicerata: Xiphosura) from the Late Devonian of Pennsylvania, USA" . Comptes Rendus Palevol . 18 (8): 967–976. doi :10.1016/j.crpv.2019.08.002 . ISSN 1631-0683 .
^ a b Dunlop, J. A.; Penney, D.; Jekel, D. (2020). "A summary list of fossil spiders and their relatives" (PDF) . World Spider Catalog . Natural History Museum Bern . pp. 1–296.