Stenoscyllium Noubhani & Cappetta 1997
| Autor: | Ebersole, Jun A., Cicimurri, David J., Stringer, Gary L. |
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| Rok vydání: | 2019 |
| Předmět: | |
| DOI: | 10.5281/zenodo.3664568 |
| Popis: | Stenoscyllium cf. S. priemi Noubhani & Cappetta, 1997 Fig. 22 Stenoscyllium priemi Noubhani & Cappetta, 1997: 70, pl. 28, figs 8–11, text-fig. 13. Scyliorhinus subulidens – Arambourg 1952: pl. 23, figs 2–4. Material examined UNITED STATES OF AMERICA – Alabama • 3 isolated teeth; Claiborne Group; MSC 35760.1 – 2, MSC 38527. Description Teeth distinctively mesiodistally compressed. Tooth crown tall and triangular with a strong lingual bend. Both lingual and labial crown faces convex with smooth enameloid. Prominent mesial and distal cutting edges present on the upper two-thirds of crown, but not reaching the crown base. Basal labial crown face slightly overhangs root. Single pair of cusplets present on some teeth. Root holaulacorhize, with closely spaced, rounded lobes. In lingual view, root height almost equal to crown height. Lingual root face with pronounced protuberance bisected by nutritive groove. Large nutritive foramina present within nutritive groove. Individual foramina located on upper-half of lingual and labial root faces. Lingual, labial, and basal root faces distinctly flat. Remarks In his type suite for Scyliorhinus subulidens, Arambourg (1952) included several teeth that he considered to represent anterior jaw positions. Working with new material recovered from lower Eocene deposits in Morocco, Noubhani & Cappetta (1997) erected Stenoscyllium priemi to include the teeth Arambourg (1952) thought were anterior teeth of the subulidens species. The genus Stenoscyllium is currently monospecific, with the only species being S. priemi. Although the roots are abraded and the cusplets are not preserved on all the specimens in our sample, their overall morphology matches that of S. priemi as figured by Arambourg (1952: pl. 23), Noubhani & Cappetta (1997: pl. 28) and Cappetta (2012: fig. 266). Due to the preservation and limited sample size, our specimens are only tentatively assigned to this species. Stratigraphic and geographic range in Alabama The specimens in our sample were collected from the lower Tallahatta Formation at site ADl-1. Upper Ypresian/ lower Lutetian, Zone NP14. Published as part of Ebersole, Jun A., Cicimurri, David J. & Stringer, Gary L., 2019, Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichthyes and Osteichthyes) of the lower-to-middle Eocene (Ypresian to Bartonian) Claiborne Group in Alabama, USA, including an analysis of otoliths, pp. 1-274 in European Journal of Taxonomy 585 on pages 60-61, DOI: 10.5852/ejt.2019.585, http://zenodo.org/record/3660259 {"references":["Noubhani A. & Cappetta H. 1997. Les Orectolobiformes, Carcharhiniformes et Myliobatiformes (Elasmobranchii, Neoselachii) des Bassins a phosphates du Maroc (Maastrichtien-Lutetien basal). Systematique, biostratigraphie, evolution et dynamique des faunes. Palaeo Ichthyologica 8: 1 - 327.","Arambourg C. 1952. Les vertebres fossiles des gisements de phosphates (Maroc-Algerie-Tunisie). Notes et Memoires du Service geologique du Maroc 92: 1 - 372.","Cappetta H. 2012. Chondrichthyes (Mesozoic and Cenozoic Elasmobranchii, Teeth). Handbook of Palaeoichthyology. Verlag Friedrich Pfeil, Munchen."]} |
| Databáze: | OpenAIRE |
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