Osmolskina czatkowicensis
Sugerowana cytacja: Tałanda, M., Piechowski, R. 2014. Osmolskina czatkowicensis Borsuk-Białynicka & Evans 2003. Ikonoteka (http://ikonoteka.paleo.pan.pl/xwiki/bin/viewrev/Species/Osmolskina+czatkowicensis)
Diagnoza Similar to Euparkeria capensis, but smaller and having a slightly overhanging premaxilla (but less so than in proterosuchids) that was weakly attached to the maxilla (with no peg and socket articulation developed), a subquadrangular nasal process of the maxilla, and a barely recessed antorbital fenestra. The preorbital part of the skull is less elongated and the orbit is more rounded. The mandible does not increase in depth posteriorly unlike that of Euparkeria. The humerus is shorter, femur more twisted. Porównanie Osmolskina and Euparkeria differ from Proterosuchus in a subvertical basisphenoid with ventro−laterally oriented basipterygoid processes, and with the entry foramina for the cerebral branches of the internal carotid arteries lying in a posteroventral position; the absence of teeth on the transverse flange of the pterygoid; and the development of a small anterior process on the ilium. They also differ in having rather short cervicals and well−developed dorsal osteoderms. In contrast to most Archosauria (excluding phytosaurs, but not rauisuchians), Osmolskina and Euparkeria lack an ossified medial wall of the otic capsule, and show poor ossification of the fenestra ovalis. Furthermore, they have a posteroventral, rather than lateral, position of the entry foramina for the cerebral branches of the internal carotid arteries, and retain teeth on the palatine plate of the pterygoid. Osmolskina is thus an archosauriform of a grade above that of Proterosuchus but outside either the erythrosuchids or the crown−group. Its position in the cladogram corresponds to that of Euparkeria. Autekologia Terrestrial, carnivorous Występowanie geograficzne Only locus typicus Zasięg czasowy Only stratum typicum Materiały muzealne Institute of Paleobiology PAN, Warsaw (ZPAL) Literatura Borsuk−Białynicka, M. and Evans S.E. 2003. A basal archosauriform from the Early Triassic of Poland. Acta Palaeontologica Polonica 48, 649–652. Borsuk−Białynicka, M. and Evans, S.E. 2009. Cranial and mandibular osteology of the Early Triassic archosauriform Osmolskina czatkowicensis from Poland. Palaeontologia Polonica 65, 235–281. Borsuk−Białynicka, M. and Sennikov, A.G. 2009. Archosauriform postcranial remains from the Early Triassic karst deposits of southern Poland. Palaeontologica Polonica 65, 283–328. |
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