Abdounia enniskilleni ( White, 1956 ),

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: 84-86

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.3664607

persistent identifier

http://treatment.plazi.org/id/18174D41-FFD6-FFFA-FDF8-99334E9C0906

treatment provided by

Plazi

scientific name

Abdounia enniskilleni ( White, 1956 )
status

 

Abdounia enniskilleni ( White, 1956) 

Fig. 31View Fig A–O

Scyliorhinus enniskilleni White, 1956: 128  , pl. 11, fig. 1, text-figs 1–9.

Abdounia enniskilleni – Cappetta 1980a: 37  .

Scyliorhinus enniskilleni – Thurmond & Jones 1981: 60  , fig. 26.

Material examined

UNITED STATES OF AMERICA – Alabama • 302 isolated teeth; Claiborne Group ; ALMNH PV1989.4.16.2a (6 specimens), ALMNH PV1989.4.23.7, ALMNH PV1989.4.32.2 (2 specimens), ALMNH PV1989.4.38.3, ALMNH PV1989.4.126c, ALMNH PV1989.4.192, ALMNH PV1989.4.194 (2 specimens), ALMNH PV1989.4.205, ALMNH PV1989.4.209 (seven specimens), ALMNH PV1989.4.210, ALMNH PV1993.2.440a (56 specimens), ALMNH PV2000.1.43.2b, ALMNH PV2000.1.43.5e (2 specimens), ANSP 23416View Materials, MSC 188.23, MSC 188.50, MSC 188.94, MSC 188.112.1, MSC 188.129, MSC 188.159, MSC 188.164, MSC 188.169, MSC 188.174, MSC 188.204, MSC 188.233, MSC 188.262 263, MSC 188.278, MSC 188.282 283, MSC 188.292, MSC 188.307, MSC 188.310 311, MSC 188.317 318, MSC 188.330 331, MSC 567, MSC 1424.2, MSC 1424.11, MSC 2171.1 6, MSC 2171.8 13, MSC 2175.49, MSC 2175.64, MSC 2175.70, MSC 2175.75 76, MSC 2372.5, MSC 2372.13, MSC 2384.1 2, MSC 12675.5 11, MSC 12686, MSC 36965, MSC 37405.1 2, MSC 37453, MSC 37513, MSC 37567.106, MSC 37568.1 4, MSC 37569, MSC 37608, MSC 37620, MSC 37696, MSC 37890.1 2, MSC 38412.1 2, MSC 38497.1 6, MSC 38507.1 14, MSC 38533.1 4, MSC 38550.1 8, NJSM 24026View Materials, WSU CC 538View Materials (4 specimens)  .

Description

Anterior teeth with tall, erect main cusp. Lingual crown face convex, often with fine longitudinal ridges extending more than half the cusp height. Labial crown face flat, smooth. Single pair of diverging lateral cusplets. Lateral teeth with broader but lower main cusp; cusp distally inclined. Single pair of divergent lateral cusplets; broader and lower than on anterior teeth. Lateroposterior teeth with more distally curving main cusp. Cutting edges of main cusp and lateral cusplets smooth, continuous. Root high, bilobate with short, rounded, diverging lobes. Lingual attachment surface flat; wide and deep nutritive groove. Interlobe area on teeth shallow and U-shaped.

Remarks

Teeth of A. enniskilleni  were differentiated from the other Abdounia  species in our sample by having a single pair of divergent cusplets in all tooth positions, and the lingual face of the main cusp generally bears fine lingual ornamentation. Additionally, this species is the largest of those we assign to Abdounia  , with anterior teeth reaching upwards of 1.5 cm in overall height. Based on our sample of teeth, and several thousand more from the Clinchfield Formation of central Georgia, the teeth of A. enniskilleni  appear extremely variable. For example, not all teeth exhibit lingual ornamentation, the main cusp within various files vary in width, and the lateral cusplets, especially in anterior positions, range from tall and narrow to low and wide. Abdounia enniskilleni  is easily distinguished from two species formerly placed within Abdounia  (see below), A. recticona  and A. claibornensis  , by the presence of a single pair of lateral cusplets, as opposed to three-to-four and four-to-eight, respectively, in the latter two taxa.

Stratigraphic and geographic range in Alabama

The specimens we examined were collected from the contact of the Tallahatta and Lisbon formations at sites ACh-14 and ACon-6, the basal Lisbon Formation at site ACov-11, the “upper” Lisbon Formation at sites ACh-8 and ACl-3, basal Gosport Sand at site ACl-4, and the Gosport Sand at sites ACh-21 and ACl-15. Lower Lutetian to middle Bartonian, zones NP14 to NP17.

ALMNH

Alabama Museum of Natural History

WSU

Weber State University, Bird and Mammal Collection

Kingdom

Animalia

Phylum

Chordata

Class

Elasmobranchii

Order

Carcharhiniformes

Family

Carcharhinidae

Genus

Abdounia

Loc

Abdounia enniskilleni ( White, 1956 )

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

Scyliorhinus enniskilleni

White E. I. 1956: 128
Loc

Abdounia enniskilleni –

Cappetta H. 1980: 37
Loc

Scyliorhinus enniskilleni –

Thurmond J. T. & Jones D. E. 1981: 60