Pachygaleus lefevrei ( Daimeries, 1891 ),

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: 65-66

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.3664574

persistent identifier

http://treatment.plazi.org/id/18174D41-FFC5-FFEE-FDE8-9C5B4E940EAC

treatment provided by

Plazi

scientific name

Pachygaleus lefevrei ( Daimeries, 1891 )
status

 

Pachygaleus lefevrei ( Daimeries, 1891) 

Fig. 23View Fig Q–V

Galaeus lefeveri Daimeries, 1891: 74  .

Eugaleus falconeri White, 1926: 73  .

Galeus lefevrei – Leriche 1905: 136  , pl. 8, figs 54–58.

Eugaleus lefevrei – Casier 1946: 84  , pl. 1, fig. 13a–b.

Galeorhinus lefevrei – Casier 1966: 86  , pl. 8, figs 4–6.

Pachygaleus lefevrei – Baut & Genault 1995: 206  , pl. 7, figs 5–6, pl. 8, figs 1–2.

Material examined

UNITED STATES OF AMERICA – Alabama • 9 isolated teeth; Claiborne Group; MSC 37688View Materials, MSC 35758.1–2, MSC 35763View Materials, MSC 38289.1–2, MSC 38487View Materials, NJSM 24024, WSU 5002.

Description

Teeth mesiodistally wider than tall. Crown labiolingually thick and conspicuously overhangs the root labially. Labial crown face flat to concave; lingual face strongly convex. Main cusp distally directed, formed from intersection of elongate, convex mesial cutting edge and much shorter distal edge. Elongated distal heel often concave, may be flat or slightly sigmoidal on lateral teeth. Distal heel with three-to-10 pronounced cusplets, which are distally directed and decreasing in size away from cusp. Crown enameloid generally smooth, but short longitudinal folds sometimes located at base of labial crown face on extreme lateral teeth or juveniles. Root thick and bulbous, bilobate, with widely diverging and rounded lobes; shallow, U-shaped interlobe area. Wide and deep nutritive groove located on lingual root face; large central foramen occurs within groove. Additional foramina present on basal portion of lingual root face.

Remarks

The genus Pachygaleus  currently only contains the species P. lefevrei ( Daimeries, 1891)  , and all of our specimens are assigned to this taxon. The Pachygaleus  teeth in our sample were separated from those of Galeorhinus  by their larger size, more convex labial crown face, wider U-shaped interlobe area and, in the case of the anterolateral teeth, up to 10 cusplets on the distal heel.

Stratigraphic and geographic range in Alabama

The specimens in our sample were collected from the lower Tallahatta Formation at site ADl-1, the contact of the Tallahatta and Lisbon formations at site ACh-14, and the basal Lisbon Formation at site ACov-11. Upper Ypresian to lower Lutetian, zones NP14 and NP15.

NJSM

New Jersey State Museum

WSU

Weber State University, Bird and Mammal Collection

Kingdom

Animalia

Phylum

Chordata

Class

Elasmobranchii

Order

Carcharhiniformes

Genus

Pachygaleus

Loc

Pachygaleus lefevrei ( Daimeries, 1891 )

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

Galaeus lefeveri

Daimeries A. 1891: 74
Loc

Eugaleus falconeri

White E. I. 1926: 73
Loc

Galeus lefevrei –

Leriche M. 1905: 136
Loc

Eugaleus lefevrei –

Casier E. 1946: 84
Loc

Galeorhinus lefevrei –

Casier E. 1966: 86
Loc

Pachygaleus lefevrei –

Baut J. - P. & Genault B. 1995: 206