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Amphicotylus stovalli
Taxonomy
Goniopholis stovalli was named by Mook (1964). Its type specimen is OUSM 39-1-S8, a skull, and it is a 3D body fossil. Its type locality is Stovall's Pit 8, Kenton (OMNH V97), which is in a Tithonian pond mudstone in the Morrison Formation of Oklahoma.
It was recombined as Amphicotylus stovalli by Sachs et al. (2019).
It was recombined as Amphicotylus stovalli by Sachs et al. (2019).
Synonymy list
| Year | Name and author |
|---|---|
| 1964 | Goniopholis stovalli Mook p. 283 fig. 1,2 |
| 2012 | Goniopholis stovalli Bronzati et al. |
| 2019 | Amphicotylus stovalli Sachs et al. |
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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.
†Amphicotylus stovalli Bronzati et al. 2012
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. C. Mook 1964 | The size is medium to small. The premaxillary region of the snout, anterior to the lateral notches, is extremely short in proportion to its breadth. The external narial aperture is short and broad. The premaxillomaxillary notches are deep. The orbits are of medium size, approximately equalling that of the supratemporal fenestrae, and are subtriangular. The interorbital plate is relatively broad and essentially flat, with a definite drop in level from this plate to the posterior end of the snout, much as in the living caimans.
The nasal bones are slender and they terminate anteriorly on the upper surface of the snout definitely posterior to the external narial aperture. The anterior process of the frontal is short and broad; it ends over the eleventh maxillary teeth. The supratemporal fenestrae are of medium size and are subtriangular. The interfenestral plate is narrow and its edges are uprolled. The fenestrae are definitely closer to the orbits than they are to the posterior border of the cranial table. On the palate the maxillaries occupy much more space than the palatines. The premaxillary fenestrae are double in character. The posterior processes of the premaxillaries are short. The palatine fenestrae are relatively short and broad; they extend forward to the level of the twelfth maxillary teeth. Five alveoli are present in each premaxillary; of these, number 3 is the largest, numbers 1, 2, 4, and 5 being approximately equal in size. Each maxillary has nineteen alveoli, of which numbers 4 and 10 are the largest. The articular processes of the quadrate bones are short. |
Measurements
No measurements are available
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| Source: subo = suborder, c = class, subp = subphylum, uc = unranked clade | |||||
| References: Kiessling 2004, Bush and Bambach 2015, Carroll 1988, Benton 1983, Hendy et al. 2009 | |||||