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XWiki.Ajdmzink

Object changes

Object number 0 of type Species.SpeciesClass modified

Diagnoza

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1		-//Czatkowiella// resembles early archosauromorphs (notably those traditionally grouped as “prolacertiforms”), and differs from lepidosauromorphs in having strongly elongated cervical vertebrae with long low neural spines and slender horizontally placed cervical ribs with an anterior process; it resembles the Late Triassic gliding kuehneosaurs and some archosauriforms, and differs from all described “prolacertiforms”, in having three-headed ribs on some anterior trunk vertebrae, but differs from kuehneosaurs in that these ribs do not attach to the ends of elongated transverse processes; resembles //Rhombopholis// in having expanded spines on the dorsal vertebrae, but differs in the other vertebral characters noted above; resembles the Late Permian //Protorosaurus// in combining long cervical vertebrae and slender horizontal cervical ribs with a primitive premaxilla lacking a posterolateral process, but differs in having a biradiate postorbital bone, paired parietals without a median crest, and cervical vertebrae that are proportionally longer in relation to their height, in the possession of some three-headed ribs, in having short dorsal vertebrae with a greater development of a spine table, and in lacking the bifid caudal neural spines that characterize all specimens of the Late Permian genus. In its combination of characters, //Czatkowiella// is unique and justifies distinct generic status. As reconstructed on the basis of most frequent bones, the skull of //Czatkowiella harae// was about 40 mm in length (on average), and is thus much shorter than that of //Prolacerta broomi// B.P.I. 2675 (about 70 mm). However, the presence of very small and very large maxillae demonstrates a range of variability that is consider to be intraspecific.
	1	+Strongly elongated cervical vertebrae with long low neural spines and slender horizontally placed cervical ribs with an anterior process; three-headed ribs on some anterior trunk vertebrae, but these ribs do not attach to the ends of elongated transverse processes; primitive premaxilla lacks posterolateral process .

Porównanie

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1		-//Czatkowiella// is relatively well known compared to other early diapsids but it has still proved difficult to classify. It shows skull and vertebral characters once thought diagnostic of the long-necked “prolacertiforms” (loss of the parietal foramen, distinct transverse processes on the dorsal vertebrae, double-headed ribs), but most recent (1998-2009) cladistic analyses have failed to support a monophyletic Prolacertiformes. Analysis suggests a relationship between //Czatkowiella// and the Late Permian //Protorosaurus// at the base of Archosauromorpha. Czatkowiella is thus to be considered a survivor of the Permian stage of archosauromorph phylogeny. However, this needs to be confirmed with a more detailed analysis at the new material of //Protorosaurus//. If this hypothesis of relationship is correct, then the similarities found between the cervical vertebrae and ribs of //Protorosaurus// (sensu stricto) and traditional “prolacertiforms” probably represent the retention of primitive character states, possibly synapomorphic for Archosauromorpha, or, given the cervical morphology of the basal diapsid //Petrolacosaurus//, for a more inclusive group.
	1	+//Czatkowiella// shows skull and vertebral characters typical of the long-necked “prolacertiforms” (loss of the parietal foramen, distinct transverse processes on the dorsal vertebrae, double-headed ribs), but is close to the Late Permian //Protorosaurus//.