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 roundedThe 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.

Specyfikacja

Królestwo
ANIMALIA 

Typ
CHORDATA 

Podtyp
VERTEBRATA 

Gromada
REPTILIA 

Podgromada
ARCHOSAURIA 

Rząd
Thecodontia

Rodzina
Euparkeriidae

Gatunek
Osmolskina czatkowicensis

Synonimy

Populacja typowa gatunku

Holotyp

The fragmentary maxilla ZPAL RV/77

Locus typicus

Czatkowice 1, southern Poland

Stratum typicum

Bone breccia in karst deposits. Early Late Olenekian


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Created by Administrator on 2014/02/20 19:40

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