Gomphogaleus rodgersi ( Case, 1994 )
|
publication ID |
https://doi.org/ 10.4202/app.2008.0306 |
|
persistent identifier |
https://treatment.plazi.org/id/03DBAF0C-FFB4-EE46-FC8D-FA71D278F884 |
|
treatment provided by |
Felipe |
|
scientific name |
Gomphogaleus rodgersi ( Case, 1994 ) |
| status |
|
Gomphogaleus rodgersi ( Case, 1994)
Fig. 5A, B View Fig .
1994 Mustelus rodgersi sp. nov.; Case 1994: 118, pl. 13: 276–281.
Material.—Four teeth.
Description.—The best preserved specimen ( Fig. 5B View Fig ) is a latero−anterior tooth. The enamel is smooth on both faces. The cusp is little detached from the rest of the crown, short and slightly erect. The crown is broader than high. The mesial cutting edge is concave except in the mesial base where it is rather strongly rounded. The distal heel is well developed, high and bears a strong, short denticle. The distal cutting edge of the cusp is short, subvertical and slightly longer than the mesial edge of the distal denticle. The distal angle is close to 90 °. The marginal part of the distal heel is rather long and slightly convex; its lateral extremity is very rounded. The labial face of the crown is nearly flat. Its basal edge is marked by a well individualized transverse bulge above the crown−root junction. Not very salient, this bulge is rounded in profile view and strongly overhangs the root. The root is thick. The two lobes are separated by a broad and deep nutritive groove that is broader labially than distally. There is a pair of large margino−lingual foramina on each side of the lingual protuberance ( Fig. 5B View Fig 2). The labial face of the root is low and concave ( Fig. 5B View Fig 2), bearing a set of small foramina that open above its basal edge. A second specimen ( Fig. 5A View Fig ) has a broken cusp and a very low and blunt denticle on the distal heel. As for the holotype, the basal bulge of the labial face is well−rounded in profile ( Fig. 5A View Fig 2) and the lingual protuberance of the root is medially salient in lingual view ( Fig. 5A View Fig 3 View Fig ). The axial groove is deep and very broad, with large foramina in variable number.
Comments.—The species G. rodgersi , described by Case (1994) from the Tuscahoma Formation of Meridian, Mississippi, USA, was erronneously interpreted and assigned to the genus Mustelus . The single specimen figured by Case (1994) is slightly larger than our teeth, not perfectly preserved but is morphologicaly very similar to our material. The age of the Tuscahoma Formation is considered as Thanetian in the work of Case (1994). Yet its selachian assemblage, particularly its richness and diversity in carcharhinids, is more consistent with an Ypresian age. G. rodgersi is also represented in the Ypresian deposits from Egem, Belgium (HC unpublished data) and in the early Ypresian of Khouribga, Basin of Ouled Abdoun, Morocco (HC unpublished data), though it is uncommon there.
Stratigraphic and geographic range.—Ypresian, French−Belgian Basin, Morocco, and Mississippi, USA.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
|
Kingdom |
|
|
Phylum |
|
|
Class |
|
|
Order |
|
|
Family |
|
|
Genus |
Gomphogaleus rodgersi ( Case, 1994 )
| Adnet, Sylvain & Cappetta, Henri 2008 |
Mustelus rodgersi
| Case, G. R. 1994: 118 |