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Trionyx ikoviensis
Taxonomy
Trionyx ikoviensis was named by Danilov et al. (2011). Its type specimen is ZIN PH 37/145, a partial skull, and it is a 3D body fossil. Its type locality is Ikovo, which is in a Lutetian marine sandstone in Ukraine.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2011 | Trionyx ikoviensis Danilov et al. p. 400 figs. Figs. 2-4 |
| 2017 | Trionyx ikoviensis Georgalis and Joyce |
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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.
†Trionyx ikoviensis Danilov et al. 2011
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| I. G. Danilov et al. 2011 | A trionychine which is most similar to modern members of Trionychini Gray, 1825 (sensu Meylan 1987) in that the parietal makes up nearly one-quarter of the processus trochlearis oticum; to species of the genus Rafetoides Karl, 1998 and/or to some species of Trionyx sensu lato (sensu Lapparent de Broin 2001) from Europe with middle-sized cara- pace and long and wide jaws and snout, especially to Trionyx michauxi Broin, 1977 from the Lower Eocene of France, in that the snout is relatively short and the maxillae form expanded triturating surfaces. It can be differentiated from Trionychini (except Rafetus Gray, 1864) by the dorsal margin of the apertura narium externa which is not strongly emarginated, and from Rafetus (and Apalonina Meylan, 1987) by the smaller intermaxillary foramen and by the vomer which does not divide the maxillae. It can be differentiated from Rafetoides by the presence of a hyoplastral shoulder. It can be differentiated from Trionyx michauxi by the skull roof narrower at the anterior border of the parietals, dorsal plate of the parietals more strongly narrowed posteriorly, slightly narrower triturating surfaces, shallower postorbital part of the maxilla, lower skull in lateral view, anteri- orly widened intermaxillary groove, wider palatines and palatine grooves, basisphenoid more widened anteriorly. |
Measurements
No measurements are available
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| Source: f = family, subp = subphylum | |||||
| References: Ernst and Barbour 1989, Carroll 1988 | |||||