Lepophidium, Gill, 1895

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: 201-202

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.3664440

persistent identifier

http://treatment.plazi.org/id/18174D41-FF4D-FF66-FDE5-985E4C720907

treatment provided by

Plazi

scientific name

Lepophidium
status

 

Lepophidium  ? mucronata ( Koken, 1888) 

Fig. 70View Fig M–N

Otolithus (Gadidarum) mucronatus Koken, 1888: 290  , 292, pl. 17, figs 10–11.

Otolithus (Gadidarum) mucronatus – Posthumus 1924: 13  .

Bauzaia mucronata – Frizzell & Dante 1965: 712–713  , pl. 86, figs 43–44.

“genus Lepophidiinorum ” mucronatus – Nolf 1980: 111  . — Breard & Stringer 1999: 135. — Müller 1999: 111, pl. 26, figs 14–20. — Nolf 2003: 4, pl. 1, figs 11–13.

“ Lepophidiinus ” mucronatus – Nolf 2013: 65  , pl. 125.

Material examined

UNITED STATES OF AMERICA – Alabama • 9 otoliths; GLS otolith comparative collection (6 specimens), MSC 39054View Materials, WSU CC 471.2View Materials, WSU CC 471.3View Materials  .

Description

Sagittae primarily of oval shape, with prominent anterodorsal dome and sharply pointed posterior. Height/length ratios tending to 38–45%. Small, juvenile specimens exhibit very slight lobed margins; larger and adult specimens with smooth margins. Anterior margin fairly evenly rounded. Anterodorsal dome typically becoming more prominent on the larger specimens. Dorsal margin often slightly incurved between dome and posterodorsal slope. Posterodorsal slope straight and gentle. Posterior attenuated into well-developed tip or projection (except for very small specimens). Ventral margin broadly, nearly evenly rounded. Inner face smooth, only very slightly convex. Divided sulcus quite long, filled with colliculum, extending almost entire length of sagitta. Ostium usually about four times longer than cauda, widths approximately equal. Dorsal and ventral margins of ostium straight, parallel. Anterior portion of ostium rounded, almost touches anterior margin. Ostium separated from cauda by straight (sometimes slanted) incised line. Short cauda about same width as ostium, approximately rectangular in shape. Posterior of cauda rounded, almost touches the posterodorsal slope. Distinct crista superior, shallow but distinct, irregularly shaped depressed area above ostium. Ventral furrow absent to poorly developed. Outer face irregularly convex, commonly sculptured.

Remarks

Lepophidium  ? mucronata  is known from several Eocene (Claibornian) localities in Texas and Louisiana. The type stratum and locality for the species is the Lisbon Formation at site AMo- 4 in Monroe County, Alabama.

Stratigraphic and geographic range in Alabama

This species was recovered from the “upper” Lisbon Formation at site ACh-8. Bartonian, zones NP16 and NP17.

WSU

Weber State University, Bird and Mammal Collection

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Ophidiiformes

Family

Ophidiidae

Loc

Lepophidium

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

Otolithus (Gadidarum) mucronatus

Koken E. 1888: 290
Loc

Otolithus (Gadidarum) mucronatus –

Posthumus O. 1924: 13