Galeorhinus louisi Adnet & Cappetta, 2008,

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, inclu, European Journal of Taxonomy 585, pp. 1-274: 63-64

publication ID

https://doi.org/10.5852/ejt.2019.585

publication LSID

lsid:zoobank.org:pub:181B6FBA-ED75-4BB4-84C4-FB512B794749

DOI

http://doi.org/10.5281/zenodo.3664560

persistent identifier

http://treatment.plazi.org/id/18174D41-FFBB-FF90-FDD0-985C4CF00B62

treatment provided by

Plazi

scientific name

Galeorhinus louisi Adnet & Cappetta, 2008
status

 

Galeorhinus louisi Adnet & Cappetta, 2008 

Fig. 23View Fig G–J

Galeorhinus louisi Adnet & Cappetta, 2008: 438  , fig. 4.

Material examined

UNITED STATES OF AMERICA – Alabama • 2 isolated teeth; Claiborne Group ; MSC 37353.1 2  .

Description

Teeth small, not exceeding 2.2 mm in mesiodistal width; distal-most extent of main cusp in line with, or slightly exceeding, distal extent of heel. Mesial cutting edge elongate, ranges from straight to slightly sinuous; distal edge much shorter, slightly convex, forms triangular and distally inclined cusp with mesial edge. Prominent distal heel bears one or two cusplets, which are not well differentiated from the heel itself. Lingual crown face smooth, strongly convex. Labial face with bulbous base that overhangs the root; very short folds and wrinkles at base that coalesce apically to form a transverse ridge (easily seen in profile view). Root high and thick, with highly diverging and rounded lobes; lobes separated by shallow and triangular interlobe area. Lingual root face bisected by deep nutritive groove.

Remarks

The teeth in our sample appear conspecific to the holotype of G. louisi Adnet & Cappetta, 2008  in that they have extensive folds and notches present along the entire width of the labial crown base. This ornamentation is indistinct or absent on the teeth of G. minutissimus  , present only beneath the heels on the teeth of G. mesetaensis  , and is much less extensive on the teeth of G. duchaussoisi  (see above) and G. ypresiensis  (see below).

Stratigraphic and geographic range in Alabama

The specimens in our sample were collected from the Tallahatta Formation at site AMo-8. Lower Lutetian, Zone NP14.

Kingdom

Animalia

Phylum

Chordata

Class

Elasmobranchii

Order

Carcharhiniformes

Family

Triakidae

Genus

Galeorhinus

Loc

Galeorhinus louisi Adnet & Cappetta, 2008

Ebersole, Jun A., Cicimurri, David J. & Stringer, Gary L. 2019
2019
Loc

Galeorhinus louisi

Adnet S. & Cappetta H. 2008: 438