Brachycarcharias twiggsensis

(Case, 1981)


Classification: Elasmobranchii Lamniformes Odontaspididae

Reference of the original description
Case, G.R. (1981)
Late Eocene selachians from South-central Georgia. Palaeontographica, Abt. A, 176(1–3), 52–79

Synonyms / new combinations and misspellings
Brachycarcharias cf. twiggsensis, Cretolamna twiggsensis, Lamna twiggsensis, Tethylamna cf. twiggsensis, Tethylamna twiggsensis

Types
Brachycarcharias twiggsensis

Tethylamna twiggsensis
Holotype: UNSM: 23506; Paratype: UNSM: 23507; UNSM: 23508; UNSM: 23509; UNSM: 23510;


Description:


Citation: Brachycarcharias twiggsensis (Case, 1981): In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 12/2021

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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.

Remarks
valid after Ebersole et al. (2019) p. 43 [27789];


References
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