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Egyptemys eocaenus
Taxonomy
Psephophorus eocaenus was named by Andrews (1901). Its type specimen is CGM 10028, a set of limb elements (humerus), and it is a 3D body fossil. Its type locality is Qasr el-Sagha, which is in an Eocene marine shale/limestone in the Qasr el-Sagha Formation of Egypt. It is the type species of Egyptemys.
It was recombined as Egyptemys eocaenus by Wood et al. (1996).
It was recombined as Egyptemys eocaenus by Wood et al. (1996).
Synonymy list
| Year | Name and author |
|---|---|
| 1901 | Psephophorus eocaenus Andrews pp. 440-441 figs. Fig. 3 |
| 1906 | Psephophorus eocaenus Andrews p. 275 |
| 1995 | Psephophorus eocaenus Köhler |
| 1996 | Egyptemys eocaenus Wood 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.
†Egyptemys eocaenus Andrews 1901
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. C. Wood et al. 1996 | Shell with at least five weakly-developed anteroposterior carapacial ridges: area between ridges flat or nearly so with small numbers of ossicles (usually 1- 2, occasionally 3) occupying areas between adjacent ridges: shell of fairly uniform thickness. Ridges semi-circular in cross-section and of essentially equal height above surrounding surfaces, except for middle ridge, which is slightly prominent: ridges confined only to central portions of ossicles which they traverse; intervening distances between adjacent ridges somewhat variable; visceral surface of carapace smooth with no indication of ridges. Individual ossicles of carapace highly variable in size and irregular in shape: ossicles occupying intervals between ridges generaIIy smaller than ossicles along ridges. Neural spine of first dorsal vertebra with parallel sides except at base, where a marked constriction occurs: anterior zygapophyses extend outward from base of neural spine at a lower level than do posterior processes: nerve opening behind neural arch considerably smaller than in Dermochelys coriacea: facets on lateral sides of neural arch for attachement of rib heads subrounded rather than parallelogram-shaped: anterior zygapophyses closely spaced near midline: vertical flange of bone present on anterior face of lower half of neural spine. Proportionately larger processus radialis of humerus and less robust humeral shaft than in any other leatherback species for which this bone is known. |