Galeorhinus louisi Adnet & Cappetta 2008
- 1. McWane Science Center, 200, 19 Street North, Birmingham, Alabama 35203, USA.
- 2. South Carolina State Museum, 301 Gervais Street, Columbia, South Carolina 29201, USA.
- 3. University of Louisiana at Monroe, Monroe, Louisiana 71209, USA.
Description
Galeorhinus louisi Adnet & Cappetta, 2008
Fig. 23 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.
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Collection code
- MSC
- Family
- Triakidae
- Genus
- Galeorhinus
- Kingdom
- Animalia
- Material sample ID
- MSC 37353.1, 2
- Order
- Carcharhiniformes
- Phylum
- Chordata
- Scientific name authorship
- Adnet & Cappetta
- Species
- louisi
- Taxon rank
- species
- Taxonomic concept label
- Galeorhinus louisi Adnet, 2008 sec. Ebersole, Cicimurri & Stringer, 2019
References
- Adnet S. & Cappetta H. 2008. New fossil triakid sharks from the Eocene of Premontre, France, and comments on fossil record of the family. Acta Palaeontologica Polonica 53 (3): 433 - 448. https: // doi. org / 10.4202 / app. 2008.0306