Tethylamna, Cappetta & Case, 2016

Zouhri, Samir, Gingerich, Philip D., Khalloufi, Bouziane, Bourdon, Estelle, Adnet, Sylvain, Jouve, Stéphane, Elboudali, Najia, Amane, Ayoub, Rage, Jean-Claude & Tabuce, Rodolphe, 2021, Middle Eocene vertebrate fauna from the Aridal Formation, Sabkha of Gueran, southwestern Morocco, Geodiversitas 43 (5), pp. 121-150 : 127

publication ID	https://doi.org/10.5252/geodiversitas2021v43a5
publication LSID	urn:lsid:zoobank.org:pub:697FC553-E37B-4EF9-97A4-950E4DEE246C
DOI	https://doi.org/10.5281/zenodo.4606615
persistent identifier	https://treatment.plazi.org/id/03923C45-FF89-FF80-30F5-FD8AFD6A13A3
treatment provided by	Felipe (2021-03-15 17:13:15, last updated 2024-11-26 04:12:25)
scientific name	Tethylamna
status

Treatment

Tethylamna cf. twiggsensis ( Case, 1981)

EXAMINED MATERIAL. — 50 isolated teeth, figured material includes FSAC Bouj-331, 332, 333, 334, 335 and 336.

DESCRIPTION

Numerous teeth are attributed to odontaspidid Tethylamna cf. twiggsensis. This species is easily recognizable by a pair of double flat cusplets on anterior ( Fig. 3A, F View FIG ) and lateral teeth ( Fig. 3 View FIG C-E).

REMARKS

The range of this species is currently restricted to the latest Lutetian-late Priabonian and its geographic distribution extends to paleotropical seas between tropical eastern Pacific, Caribbean and oriental Neotethys ( Casier 1971; Case 1981; Case & Borodin 2000; Case & Cappetta 1990; Ward & Wiest 1990; Adnet et al. 2007; Underwood et al. 2011; Cappetta & Case 2016). Originally described from the late Eocene of Georgia, United States ( Case 1981), distinction between the middle and the late Eocene representatives are sometimes controversial. The Bartonian teeth have lateral cusplets less pronounced compared to those from Priabonian ( Underwood et al. 2011) explaining why they are often referred to confer twigssensis. These Bartonian samples could corresponds to intergradual change from the possible ancestor T. dunni of Cappetta & Case (2016) recovered from the Lutetian of Alabama, USA toward those of Priabonian, including type of species ( Case 1981).

References

ADNET S., ANTOINE P. O., HASSAN BAQRIS. R., CROCHET J. Y., MARIVAUX L., WELCOMME J. L. & METAIS G. 2007. - On the first modern and tropical Selachian association (Chondrichthyes) from the late Eocene-early Oligocene of Baluchistan, Pakistan. Dating interests, paleoenvironment and paleobiogeography. Journal of Asian Earth Sciences 30: 303 - 323. https: // doi. org / 10.1017 / S 0016756810000348

CAPPETTA H. & CASE G. R. 2016. - A Selachian Fauna from the middle Eocene (Lutetian, Lisbon Formation) of Andalusia, Covington County, Alabama, USA. Palaeontographica Abteilung A 307 (1 - 6): 43 - 103.

CASE G. R. 1981. - Late Eocene selachians from South-central Georgia. Palaeontographica Abteilung A 176 (1 - 3): 52 - 79.

CASE G. R. & CAPPETTA H. 1990. - The Eocene Selachians Fauna from the Fayum Depression in Egypt. Palaeontographica Abteilung A 212: 1 - 30.

CASE G. R. & BORODIN P. D. 2000. - Late Eocene selachian from the Irwinton Sand Member of the Barnwell Formation (Jacksonian), WKA mines, Gordon, Wilkinson County, Georgy. Munchner Geowissenschaftliche Abhandlungen 39: 5 - 16.

CASIER E. 1971. - Sur un materiel ichthyologique des ' Midra (and Saila) shales' du Qatar (Golfe Persique). Bulletin de l'Institut royal des Sciences naturelles de Belgique 47 (2): 1 - 9

UNDERWOOD C. J., WARD D. J., KING C., ANTAR S. M., ZAL- MOUT I. S. & GINGERICH P. D. 2011. - Shark and ray faunas in the middle and late Eocene of the Fayum area, Egypt. Proceedings of the Geologists' Association 122: 47 - 66. https: // doi. org / 10.1016 / j. pgeola. 20

WARD J. W. & WIEST R. L. 1990. - A checklist of Palaeocene and Eocene sharks and rays (Chondrichthyes) from the Pamunkey Group, Maryland and Virginia, USA. Tertiary Research 12: 81 - 88.

Figures

FIG. 3. — Elasmobranchii from Sabkha of Gueran collected around the Archaeocete whale carcasses.(A-F) Tethylamna cf.twiggsensis: A, FSAC Bouj-331 anterior lower tooth in labial view; B, FSAC Bouj-332 anterolateral lower tooth in labial view; C, FSAC Bouj-333 lateral lower tooth in (C1) labial and (C2) lingual views; D, FSAC Bouj-334 posterior lower tooth in labial view; E, FSAC Bouj-335 lateral lower tooth in (E1) labial and (E2) lingual views; F, FSAC Bouj-336 anterior upper tooth in (F1) labial and (F2) lingual views. G-I, Galeocerdo cf. eaglesomei; G, FSAC Bouj-337 anterior tooth in (G1) labial and (G2) lingual views; H, FSAC Bouj- 338 anterolateral tooth in lingual view; I, FSAC Bouj-339 lateral tooth in (I1) labial and (I2) lingual views. Scale bar: 10 mm.