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Eochelone
Taxonomy
Eochelone was named by Dollo (1903) [Sepkoski's age data: T Eo-m]. It is not extant.
It was assigned to Eocheloniinae by Weems (1988); to Chelonia by Sepkoski (2002); and to Cheloniidae by Carroll (1988), Hirayama (1995), Grant-Mackie et al. (2011) and de Lapparent de Broin et al. (2018).
It was assigned to Eocheloniinae by Weems (1988); to Chelonia by Sepkoski (2002); and to Cheloniidae by Carroll (1988), Hirayama (1995), Grant-Mackie et al. (2011) and de Lapparent de Broin et al. (2018).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1903 | Eochelone Dollo |
| 1988 | Eochelone Carroll |
| 1988 | Eochelone Weems p. 141 figs. Table 2 |
| 1995 | Eochelone Hirayama p. 282 |
| 2002 | Eochelone Sepkoski |
| 2011 | Eochelone Grant-Mackie et al. |
| 2018 | Eochelone de Lapparent de Broin 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.
G. †Eochelone Dollo 1903
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†Eochelone athersuchi Moody 1980
†Eochelone brabantica Dollo 1903
†Eochelone monstigris Grant-Mackie et al. 2011
†Eochelone voltregana de Lapparent de Broin et al. 2018
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. de Lapparent de Broin et al. 2018 | Cheloniid species belong to an informal Eocene– Oligocene group differ from the toxochelyids, the Euclastes group and Erquelinnesia by a slight anterior protrusion of the carapace border produced at the nuchal and peripherals 1 with slight lateral incurvation in the border of peripherals 1 to 3, absence of nuchal fontanelles and a longer and narrower plastron. Shared with the other members of the informal group are the presence of 11 pairs of peripherals and marginals (instead of 12 pairs seen in some living Cheloniidae where the second pairs are divided), continuous neural series composed of nine plates without secondary divisions (seen in Allopleuron and living Cheloniidae), 2 to 3 suprapygals without neural series interruption and suprapygal divisions (both seen in some living forms), development of the trochanter major of the humerus (as in living forms but less developed) and a ventrally directed minor trochanter of the humerus (as in living forms but the trochanter not bent on the intertochanteric fossa and without arched deltopectoral crest). The informal group also differs from the Allopleuron- Osonachelus group principally by the absence of a welldeveloped secondary shell elongation, the absence of reduction of the dermal ossification of all the shell elements and the slightly less elongated humerus major trochanter. |