Metadata changes

Parent

Species.REPTILIA Laurenti, 1768 suchidae

Object changes

Object number 0 of type Species.SpeciesClass modified

Diagnoza

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1		-A small archosauriform. Cervical centra 12–13 mm in adult length, smaller than in any other known archosauriforms except euparkeriids. 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 the East European rauisuchids //Tsylmosaurus//, //Vytshegdosuchus//, and //Dongusuchus// except in smaller size. Weak development of ventral crests makes the vertebrae most similar to those of //Tsylmosuchus//, but posteroventral obliquity of the centrum is less. In cervicals the centrum length to posterior depth index is about 2.07 except at the transition between cervical and dorsal series where it drops to 1.8. In caudals it ranges from 1.9 to 3.7 and increases down the tail.
	1	+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.

Literatura

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1		-Borsuk−Białynicka, M. and Sennikov, A.G. 2009. Archosauriform postcranial remains from the Early Triassic karst deposits of
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3		-southern Poland. //Palaeontologica Polonica //**65**, 283–328.
	1	+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.

Porównanie

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1		-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 (about 6 mm cervical centrum length and a length-to-height proportion of about 4.0). The other archosauriform type dorsal, sacral, and caudal vertebrae are tentatively associated with the cervicals. Their conspecificity is highly likely. All the vertebrae in this series are mature as shown by the completely closed neurocentral sutures.
	1	+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.
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3		-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//. There were considered six species: //T. samariensis//, //T. jakovlevi//, //T. donensis//, //V. zheshartensis//, //D. efremov//, and //E. garjanovi//, to be consecutive members of the same phylogenetic line, ranging from Early Olenekian to Ladinian. This hypothesis is based on the common possession of 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. As these taxa are represented by isolated bones, no other feature can be used to unite them. Just two species, //T. jacovlevi// and //V. zheshartensis//, include fragmentary ilia with a supra-acetabular buttress that approximates the rauisuchid condition, and this forms the basis for the rauisuchid attribution of the whole group. //Collilongus// cervical vertebrae are much smaller and less sloping (1 to 9°), less waisted, and slightly less ventrally concave, but otherwise quite similar to those of any of these apparent rauisuchids. However, no synapomorphy can be named to support their relationships.
	3	+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.