|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Is something missing? Join the Paleobiology Database and enter the data
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.
|M. K. Hecht 1992||A choristoderan distinguished from other members of this group by the presence of the following complex of autapomorphes : a, elongated paired dorsal nares set high on snout ; b, nares separated at midline by reduced nasals and premaxilla ; c, broad squamosal-postorbital bar ; d, premaxilla spine lengthened posteriorly; e, tooth rows on the pterygoid and palatine consist of isolated large teeth ; f, osteodermal ossifications around border of supratemporal fenestra and on temporal arch ; g, complex rugose ornamentation on most skull bones ; h, cervical ribs broad, flattened and expanded with large capitulum in relation to tuberculum; i, postzygapophoseal tubercle on cervicals ; j, weak accessory vertebral articulation below postzygapophysis; k, no trunk intercentra ; I, ectepicondylar groove bridged to form foramen ; m, unguals narrow and not flattened.|