| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Taxonomy
Isoninia borealis was named by Godfrey et al. (2021). Its type specimen is CMM-V-4061, a partial skull (incomplete skull, preserving the posterior facial re- gion, from the lateral margins of the bony nares to the supraoccipital, including the vertex. Ventrally, p), and it is a 3D body fossil. Its type locality is Meherrin River, which is in a Pliocene marine horizon in the Yorktown Formation of North Carolina. It is the type species of Isoninia.
Synonymy list
| Year | Name and author |
|---|---|
| 2021 | Isoninia borealis Godfrey et al. p. 277 figs. Figs. 2 and 3 |
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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.
†Isoninia borealis Godfrey et al. 2021
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. J. Godfrey et al. 2021 | Isoninia is diagnosed on the basis of the following unique combination of features, most of which are not apomorphic: anteriorly retracted premaxillae and maxillae (i.e., no contact between premaxillae and nasals and maxillae retracted ante- riorly from the sides of the frontals below the vertex); large posterior-most dorsal infraorbital foramen at approximately the same level with posterior margin of external bony nares; robust nasals, anteroposteriorly longer than transversely wide in dorsal view with ventrolateral margins turned ventrome- dially to form ridges deeply imbedded within correspond- ing troughs in frontals (italicized text represents an apomor- phy); nasals large; nasals with transversely convex dorsal sur- face; dorsal surface of nasals not inflated; elevated, bilater- ally compressed nearly symmetrical vertex, narrower than external bony nares; frontals form apex of the vertex; pres- ence of os suturarum (or extra folds of the frontals or a pro- jection of the interparietal) at the vertex; in ventral view, pro- nounced fossa on ventrolateral face of frontal below and be- hind postorbital process of frontal for the postorbital lobe of the pterygoid sinus (the postorbital recess). |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||