Anoxypristis, White & Moy-Thomas, 1941

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: 108-110

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.3664643

persistent identifier

http://treatment.plazi.org/id/18174D41-FFEE-FFC2-FD7C-9B64484B0D5F

treatment provided by

Plazi

scientific name

Anoxypristis
status

 

Anoxypristis  sp.

Fig. 39View Fig A–I

Anoxypristis aff. mucrodens – Cappetta & Case 2016: 62–63  , pl. 10, figs 9–12.

Material examined

UNITED STATES OF AMERICA – Alabama • 18 isolated teeth; Claiborne Group ; ALMNH PV1985.87.10, ALMNH PV1985.87.9, ALMNH PV1992.56.4 (2 specimens), MMNS VP-8946 (3 specimens), MMNS VP-8952 (3 specimens), MSC 35791, MSC 37289, MSC 37310, MSC 37333, MSC 37422, MSC 37643, MSC 37658, WSU CC 549View Materials  .

Description

Rostral spines dorsoventrally flattened and symmetrical in either of these views. Spines have a slight ventral bend and weakly convex dorsal and ventral faces. Anterior and posterior edges straight and rounded basally, becoming sharp and tapering gently to a rounded point. No posterior groove present. Spine slightly wider basally, where transverse growth lines visible dorsally and ventrally. Growth lines visible ventrally almost to the spine apex. Faint mediolateral striations visible on ventral face. Spine base ovate and with weak central depression. Entire spine lacks an enameloid covering.

Remarks

The Anoxypristis  rostral spines in our sample were differentiated from those of Pristis  by having thin anterior and posterior edges, as opposed to a wide and flat or grooved posterior edge on Pristis  spines. Anoxypristis  spines can be differentiated from those of Propristis  (see below) in being anteroposteriorly narrower and much more elongated, with a correspondingly more pointed apex. Anoxypristis  spines in our sample are similar to a specimen assigned by Case & Cappetta (1990) to Anoxypristis aff. mucrodens  , but we refrain from speciating these specimens because the range of variation in rostral spine morphology is inadequately known within the two Eocene species of Anoxypristis  , including A. fajumensis ( Stromer, 1905a)  and A. mucrodens ( White, 1926)  . The spines in our sample differ from those of Mesopristis osonensis Farrés, 2003  from the middle Eocene of Spain in their lack a distinctive V-shaped basal concavity. The concavity occurring on M. osonensis  spines fits over a thin projection emanating from the base of the alveolus of the rostrum, forming a tongue-and-groove articulation.

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 the basal Lisbon Formation at site ACov-11, and the basal Gosport Sand at site ACl-4. Upper Ypresian 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

Pristiformes

Family

Pristidae

Loc

Anoxypristis

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

Anoxypristis aff. mucrodens – Cappetta & Case 2016: 62–63

- Cappetta & Case 2016: 62
2016