Diagnoza

From known euparkeriids it differs in having more elongate and cylindrical cervical centra, and costal articulations barely protruding from the body of the centrum, while resembling rauisuchids except for a small size.

Porównanie

The vertebrae of Collilongus rarus approximate prolacertiform type vertebrae in the proportions of the cervical centra, but their short, tall neural spines contrast with the elongated crest-like prolacertiform type cervical neural spines. Prolacertiform vertebrae in the Czatkowice 1 material belong to animals of much smaller size. The other archosauriform type dorsal, sacral, and caudal vertebrae are tentatively associated with the cervicals.

In their elongate shape, the cervical vertebrae of Collilongus most closely resemble those of Olenekian rauisuchids from Russia, and particularly those of the group including Tsylmosuchus, Vytshegdosuchus, Dongusuchus, and Energosuchus. Their species T. samariensis, T. jakovlevi, T. donensis, V. zheshartensis, D. efremov, and E. garjanovi, were proposed to be members of the same phylogenetic lineage, ranging from Early Olenekian to Ladinian, based on elongate cervical vertebrae with a central axis sloping posteroventrally at 6–20°; a concave ventral centrum profile; and diapophyses and parapophyses that hardly protrude from the centrum. 

Autekologia

Terrestrial

Występowanie geograficzne

Only locus typicus

Zasięg czasowy

Only stratum typicum

Materiały muzealne

Institute of Paleobiology PAN, Warsaw (ZPAL)

Literatura

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.