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Sarcodectes magnus
Taxonomy
Sarcodectes magnus was named by Rule et al. (2020). Its type specimen is USNM PAL 475486 and is a 3D body fossil. Its type locality is Lee Creek Mine, Yorktown Formation, which is in a Zanclean estuary/bay sandstone in the Yorktown Formation of North Carolina.
Synonymy list
| Year | Name and author |
|---|---|
| 2020 | Sarcodectes magnus Rule et al. p. 6 figs. Fig. 2-8 |
| 2024 | Sarcodectes magnus Rule and Park p. 11 figs. Table 2 |
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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.
†Sarcodectes magnus Rule et al. 2020
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. P. Rule et al. 2020 | A phocid on the basis of: the bulbous inflated tympanic bulla, nasal inserted between the
frontals and a pachyosteosclerotic mastoid. A monachine due to: the presence of four instead of six upper incisors (the latter state for all phocines except C. cristata); the premaxilla forming the lateral border of the nasal aperture, which is partially obscured in lateral view; the carotid foramen being visible in ventral view and a mastoid that is obscured in dorsal view. A large seal, of an adult size comparable to the extant H. leptonyx. Differentiated from all other phocids by the following combination of features: on the upper postcanines, the height of the main cusp is less than twice the height of the accessory cusps, with thin carinae on both the mesial and distal edge (absent in all phocids except Monachini); distinct intercuspid notch between the main cusps and immediate distal accessory cusp; the postcanine teeth are not obliquely orientated (unlike Monachini), with the cusps of each tooth orientated in the mesial–distal plane; the diastema separating the PC4 and PC5 is large relative to the other diastemas in the upper postcanine tooth row (present in both ‘stem’ and crown-lobodontins to the exception of Lobodon and Ommatophoca); the lateral surface of the posteroventral apex of the tympanic bulla covers the petrosal, but is not covered by the mastoid (similar to Mirounga); the mastoid, on the posteroventral surface, possesses an enlarged, convex protuberance that flares laterally, which is lacking in other monachines; viewed dorsally, the region of the squamosal that lies dorsal to the mastoid barely extends past the auricular opening, resulting in a lack of a post-auricular shelf (also present in Mirounga, Hydrurga and Monotherium? wymani); the external auditory meatus extends anteriorly as a groove onto the post- glenoid process (also present on Erignathus, and more subtly on Cystophora); possesses a large, rounded, antero-posteriorly thick medial epicondyle on the humerus, with a proximally located fossa for the origin of the pronator teres on its anterior surface; and possesses a combination of a medio- laterally thickened deltopectoral crest that is obliterated on the shaft distally (in posterior view), no fossa for the medial head of the triceps brachii, a virtually absent radial fossa, a shallow olecranon fossa and a lateral epicondylar crest that does not project posteriorly. |
Measurements
No measurements are available
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| Source: f = family, c = class, uc = unranked clade | |||||
| References: Hendy et al. 2009, Carreño and Cronin 1993, Nowak 1991, Gingerich 2003 | |||||