gen. indet. sp. indet., Bonaparte, 1832,

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: 164

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.3664310

persistent identifier

http://treatment.plazi.org/id/18174D41-FF26-FF0C-FD75-9E9B4ED60A47

treatment provided by

Plazi

scientific name

gen. indet. sp. indet.
status

 

Gen. et sp. indet  .

Fig. 61View Fig A–H

Material examined

UNITED STATES OF AMERICA – Alabama • 16 isolated teeth; Claiborne Group ; MSC 35778, MSC 37242, MSC 37307.1 2, MSC 37391, MSC 37515, MSC 37654, MSC 38443, MSC 38444, MSC 38488, MSC 38532, WSU CC 456View Materials, WSU CC 488View Materials (3 specimens), WSU CC 555View Materials  .

Description

Conical teeth up to 1.0 cm in height. Teeth sharply pointed, posteromedially curving, lack carinae. Crown enameloid thin, smooth, not extending to tooth base; apex solid and preserved with different color. Circular basal outline; deep conical pulp cavity. Enameloid often not preserved on lateral edges of the tooth, but almost always preserved at tooth apex.

Remarks

The teeth in our sample fall into two categories, including conical with a wide base, and elongate and cylindrical, with narrow base. The former morphology is similar to those of several Paleogene genera within the Osteoglossidae  , including Brychaetus Agassiz, 1845  , Phareodus Leidy, 1873  , and Ridgewoodichthys Taverne, 2009. These genera are largely differentiated by cranial and dental bones, and difficult to distinguish only from isolated teeth (see Taverne 2009: figs 3, 5). Because our sample consists only of isolated teeth, it is unclear if these two morphologies reflect heterodonty within a single species or represent multiple coeval species.As a result, all are herein assigned only to the Osteoglossidae  .

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 and basal Lisbon Formation at site ACov-11, the “upper” Lisbon Formation at site ACh-8, the basal Gosport Sand at site ACl-4, and the Gosport Sand at site ACl- 15. Upper Ypresian to middle Bartonian, zones NP14 to NP17.

WSU

Weber State University, Bird and Mammal Collection