Tethylamna cf. twiggsensis
(Case, 1981)
Classification: Elasmobranchii Lamniformes Odontaspididae
Reference of the original description
Late Eocene selachians from South-central Georgia. Palaeontographica, Abt. A, 176(1–3), 52–79
Late Eocene selachians from South-central Georgia. Palaeontographica, Abt. A, 176(1–3), 52–79
Types
Tethylamna cf. twiggsensis
Tethylamna cf. twiggsensis
Description:
Citation: Tethylamna cf. twiggsensis (Case, 1981): In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 05/2024
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Description
Diagnosis after Case 1981 [391]: Teeth ranging in size from 1.5 to 3 cms, and averaging 2.5 cms, a vestigial median furrow (groove) on the root area, teeth with from 1 to 2 lateral cusps on either side. Description: Lower jaw teeth erect. Anterior teeth with slender cuspidate lateral cusps. Lateral teeth wider, with from 1 to 2 lateral cusps, triangular in shape, and the larger of the cusps — flaring out in opposite directions from the tooth blade. No medial furrow (groove), but an imperfectly developed "furrow" on some specimens, with a definitive apical foramen positioned on the lingual boss of the tooth's root.
Diagnosis after Case 1981 [391]: Teeth ranging in size from 1.5 to 3 cms, and averaging 2.5 cms, a vestigial median furrow (groove) on the root area, teeth with from 1 to 2 lateral cusps on either side. Description: Lower jaw teeth erect. Anterior teeth with slender cuspidate lateral cusps. Lateral teeth wider, with from 1 to 2 lateral cusps, triangular in shape, and the larger of the cusps — flaring out in opposite directions from the tooth blade. No medial furrow (groove), but an imperfectly developed "furrow" on some specimens, with a definitive apical foramen positioned on the lingual boss of the tooth's root.
Remarks
shark-references Species-ID=15373;
shark-references Species-ID=15373;
References
Middle Eocene vertebrate fauna from the Aridal Formation, Sabkha of Gueran, southwestern Morocco. Geodiversitas, 43(5), 121–150
DOI: 10.5252/geodiversitas2021v43a5
Middle Eocene vertebrates from the sabkha of Gueran, Atlantic coastal basin, Saharan Morocco, and their peri-African correlations. Comptes Rendus Geoscience, 350(6): 310-318
DOI: 10.1016/j.crte.2018.06.006
Middle Eocene vertebrate fauna from the Aridal Formation, Sabkha of Gueran, southwestern Morocco. Geodiversitas, 43(5), 121–150
DOI: 10.5252/geodiversitas2021v43a5
Middle Eocene vertebrates from the sabkha of Gueran, Atlantic coastal basin, Saharan Morocco, and their peri-African correlations. Comptes Rendus Geoscience, 350(6): 310-318
DOI: 10.1016/j.crte.2018.06.006
