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Taxonomy
Ediscetus osbornei was named by Albright et al. (2018). Its type specimen is SC2015.33.1, a partial skull, and it is a 3D body fossil. Its type locality is Givhans Ferry State Park, upstream 3 km, which is in a Rupelian marine horizon in the Ashley Formation of South Carolina. It is the type species of Ediscetus.
Synonymy list
| Year | Name and author |
|---|---|
| 2018 | Ediscetus osbornei Albright et al. p. 3 figs. Figs. 3–7, 8A, B, 9 |
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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.
†Ediscetus osbornei Albright et al. 2018
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. B. Albright et al. 2018 | Small odontocete (bizygomatic width 1⁄4 199 mm) with anteriorly attenuating rostrum; small, heterodont teeth; procumbent apical teeth; minimal cranial asymmetry; antorbital notch $90; expansion of mesorostral groove into external nares beginning approximately 1cm anterior to antorbital notch; triangular, wedge-shaped nasals; ‘V’-shaped frontonasal suture; posterior temporal crest (1⁄4 posterior frontomaxillary suture) prominent, transversely oriented, nearly vertical, abuts nuchal crest (anterior margin of supraoccipital) resulting in no exposure of parietals across vertex of skull; parietals exposed dorsally only as tiny ‘parietal triangles’ where posterior temporal crest and nuchal crest diverge (i.e., intertemporal constriction nearly absent); anterior-most point of nuchal crest anterior to ‘squamosal notch’ (new term; see Fig. 3); and exter- nal auditory meatus angled posteromedially (not perpendicu- larly) relative to sagittal plane. Ediscetus osbornei superficially resembles Waipatia maerewhenua Fordyce, 1994, but differs from the latter in smaller size; relatively narrower vertex; tri- angular, wedge-shaped nasals and ‘V’-shaped frontonasal suture; postorbital border of temporal crest curved, not straight; posterior frontomaxillary suture abuts nuchal crest resulting in minimal dorsal exposure of parietals; external auditory meatus angled posteromedially (not perpendicularly) to sagittal plane; postglenoid process tapers to a point, not squared-off, in lateral view; postglenoid process ‘comma-shaped’ in ventral view due to posteromedial excavation by tympanosquamosal recess; tympanosquamosal recess less anteriorly extended; and shallow pterygoid sinus fossa. In addition to previously noted characters, Ediscetus osbornei differs from Waipatia hectori (Tanaka and Fordyce, 2015b) in the absence of a long, slender, post- orbital process. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||