Jacquhermania duponti ( Winkler, 1876 ),

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: 120-122

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.3664657

persistent identifier

http://treatment.plazi.org/id/18174D41-FFF2-FFD6-FDE1-98724CF108DC

treatment provided by

Plazi

scientific name

Jacquhermania duponti ( Winkler, 1876 )
status

 

Jacquhermania duponti ( Winkler, 1876) 

Fig. 43View Fig

Cestracion duponti Winkler, 1876: 17  , figs 1–3.

Raja aequilateralis Dartevelle & Casier, 1959: 329  , fig. 85, pl. 35, fig. 12. Raja duponti – Leriche 1905: 100  , pl. 4, figs 26–28.

Raja  sp. – Dartevelle & Casier 1943: 177, pl. 11, fig. 15.

Dasyatis duponti – Cappetta 1972: 202  , pl. 4, figs 11–18.

Jacquhermania duponti – Cappetta 1982: 116  , pl. 1, figs 1–10. — Clayton et al. 2013: figs 5i–j.

Material examined

UNITED STATES OF AMERICA – Alabama • 28 isolated teeth; Claiborne Group ; ALMNH PV1993.2.337 (5 specimens), ALMNH PV1993.2.376 (8 specimens), MSC 37519View Materials, MSC 37553.1 3, MSC 38463, MSC 38484, SC 2012.47.4, SC 2012.47.5, SC 2012.47.155 (2 specimens), SC 2012.47.157, WSU 11View Materials, WSU 15View Materials, WSU CC 502.2View Materials, WSU CC 512View Materials  .

Description

Teeth do not exceed 1.5 mm in mesiodistal width. Crown cuspidate, triangular in labial, lingual and profile views. In oral view, labial face rather narrow, triangular and flanked by smooth edges; lingual face more extensive and very convex. Labial face concave along tooth height. All enameloid smooth. Crown overhangs the root labially, but root lobes extend beyond crown base laterally and lingually. Root bilobed with deep medial furrow, and convex, sub-triangular basal attachment surfaces.

Remarks

Jacquhermania Cappetta, 1982  is a monospecific genus, with the only named species being J. duponti ( Winkler, 1876)  . This species was originally placed within the genus Cestracion  by Winkler (1876), then later referred to Raja  and Dasyatis  by Leriche (1905) and Cappetta (1972), respectively. Cappetta (1982) discussed how the teeth examined by Leriche (1905) as Raja duponti  actually represented two separate taxa, Coupatezia woutersi  and Cestracion duponti  , the latter of which was placed into a new genus, Jacquhermania  .

Teeth of Jacquhermania  are generally easy to distinguish from all other coeval batoids within the Lisbon Formation and Gosport Sand. The combination of a very convex lingual face, small and concave labial face flanked by smooth cutting edges, lack of lingual uvulae, smooth enameloid, and cuspidate crown separate Jacquhermania  from “ Dasyatis  ”, Aturobatis  , “ Rhinobatos  ”, and Hypolophodon  , as well as the lateral teeth of the various members of the Myliobatidae  . Two teeth from the Lisbon Formation, one of which was illustrated by Clayton et al. (2013) as Gymnura  sp., are unusual in being very high highcrowned but otherwise similar to Jacquhermania  in our sample. These two teeth have a weakly concave labial face flanked by lateral cutting edges, the labial crown foot is drawn out into mesial and distal projections, but there is a conspicuous medial embayment at the lingual crown foot. These specimens ( Fig. 43View Fig E–I, N–R) could represent anteriorly located teeth and/or potentially a male morphological variant of Jacquhermania  as indicated by Cappetta (1982).

Stratigraphic and geographic range in Alabama

The specimens in our sample were collected from the basal Lisbon Formation at site ACov-11, the basal Gosport Sand at site ACl-4, and the Gosport Sand at site ACl-15. Lower Lutetian to middle Bartonian, zones NP15 to NP17.

ALMNH

Alabama Museum of Natural History

Kingdom

Animalia

Phylum

Chordata

Class

Elasmobranchii

Order

Myliobatiformes

Family

Gymnuridae

Genus

Jacquhermania

Loc

Jacquhermania duponti ( Winkler, 1876 )

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

Cestracion duponti

Winkler T. C. 1876: 17
Loc

Raja aequilateralis

Dartevelle E. & Casier E. 1959: 329
Leriche M. 1905: 100
Loc

Raja

Dartevelle E. & Casier E. 1943: 177
Loc

Dasyatis duponti –

Cappetta H. 1972: 202
Loc

Jacquhermania duponti –

Cappetta H. 1982: 116