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Gyrinodon quassus
Taxonomy
Gyrinodon quassus was named by Hopwood (1928) [Comment by Hopwood, 1928 (about the holotype M 13158 B.M.G.D): "these are parts of one individual, but should this be questioned by a future investigator, I hereby select the left mandibular ramus as holotype".]. Its type specimen is M 13158 B.M.G.D, a mandible (part of the left mandibular ramus with the three molars broken off at the level of the alveolar border), and it is a 3D body fossil. Its type locality is South of El Mene Oilfield, which is in a Pliocene terrestrial horizon in Venezuela. It is the type species of Gyrinodon.
Synonymy list
| Year | Name and author |
|---|---|
| 1928 | Gyrinodon quassus Hopwood |
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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.
†Gyrinodon quassus Hopwood 1928
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. T. Hopwood 1928 | The same as the genus (Gyrinodon): frontal region of skull passing gently into the anterior portion of the temporal fossa. Post-orbital processes greatly reduced. Neither the superior margin of the orbit nor the roof of the nasal chamber is inflated. Upper lateral incisor curved in an arc of 180º or more. First and second upper molars with slight metaloph; third molar with long, concave ectoloph, but no metaloph. Mandibular symphysis not extending backwards to the second lower molar. Third lower molar without a second, posterior fold in the enamel of the lingual surface. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: MacFadden et al. 1996, Ji et al. 2002, Hendy et al. 2009, Carroll 1988, Lillegraven 1979 | |||||