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Baptemys nanus
Taxonomy
Gomphochelys nanus was named by Bourque et al. (2015). Its type specimen is UF 225761, a partial skeleton, and it is a 3D body fossil. Its type locality is UF locality WY06111, which is in an Eocene terrestrial horizon in the Willwood Formation of Wyoming.
It was recombined as Baptemys nanus by Joyce and Bourque (2016).
It was recombined as Baptemys nanus by Joyce and Bourque (2016).
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Gomphochelys nanus Bourque et al. p. 7 figs. 3-6+8 |
| 2016 | Baptemys nanus Joyce and Bourque |
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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.
†Baptemys nanus Bourque et al. 2015
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. R. Bourque et al. 2015 | Gomphochelys nanus differs from other dermatemydids
by the following: relatively small adult size for the family Dermatemydidae (carapace »32 cm long for UF 225761); bones of the shell robust with thickened peripherals and pygal (shared with Agomphus pectoralis); pygal lacks keel or crest (shared with Agomphus and Dermatemys mawii); posterior peripherals relatively straight and shortened (shared with A. pectoralis); marginal scutes short in dorsal aspect with narrow underlap ventrally (shared with A. pectoralis); plastral forelobes and hindlobes reduced; entoplastron reduced, about as wide as long or only slightly wider than long (shared with A. pectoralis); and gular– humeral sulcus positioned either along, just anterior to, or just posterior to the ento–hyoplastral suture. The following are synapomorphies of G. nanus and other dermatemydids: costiform processes extend across P1 and terminate in the anterior third of P2 (shared with some Notomorpha garmanii, Staurotypus, Claudius, and Hoplochelys); three pronounced longitudinal carinae on the dorsum of the carapace (shared with N. garmanii, Hoplochelys, and Agomphus alabamensis) composed of a set of rounded lateral carinae that extend from the posterior half of C1 to posterior-most C7, as well as a pronounced dorsally flattened medial keel that extends from the posterior N1 (at the intervertebral sulcus for V1–2), is interrupted at the V4–5 sulcus on N8, and terminates on the suprapygals (terminates on N8 in referred specimen UF 249085); pygal wider than long (it is longer than wide in most N. garmanii and in all Baptemys wyomingensis and Dermatemys examined); and xiphiplastron pointed and lacks caudal notch (shared with A. pectoralis, Hoplochelys, and N. garmanii). |
Measurements
No measurements are available
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| Source: g = genus, superf = superfamily, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Uetz 2005, Carroll 1988, Holroyd et al. 2001 | |||||
Age range: Early/Lower Eocene or 55.80000 to 48.60000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Eocene | USA (Wyoming) | Gomphochelys nanus (type locality: 176522) |