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Collilongus rarus

Reptilia -

Taxonomy
Collilongus rarus was named by Borsuk−Białynicka and Sennikov (2009). Its type specimen is ZPAL RV/580, a set of vertebrae (Cervical vertebra), and it is a 3D body fossil. Its type locality is Czatkowice 1 quarry, which is in an Olenekian fissure fill limestone/limestone in Poland. It is the type species of Collilongus.

Synonymy list
YearName and author
2009Collilongus rarus Borsuk−Białynicka and Sennikov p. 313

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
RankNameAuthor
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
genusCollilongus
speciesrarus

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
M. Borsuk−Białynicka and A. G. Sennikov 2009A 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.