Percoidei indet. 2, Giill, 1861

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, including an analysis of otoliths, European Journal of Taxonomy 585, pp. 1-274 : 212-213

Percoidei indet. 2

Material examined

UNITED STATES OF AMERICA – Alabama • 4 otoliths; GLS otolith comparative collection.

Description

Sulcus distinctly divided, clearly heterosulcoid. Ostium generally wide, cauda much narrower. Cauda uniform in width, bent ventrally. Ostium tends to widen in ventral direction.

Remarks

The four specimens exhibit features associated with percoids (Suborder Percoidei, Order Perciformes ), like a broad ostium that tends to widen in the ventral direction, and a much narrower cauda that is uniform in its width and bent in a ventral direction at the posterior. Unfortunately, the specimens could not be identified to a specific perciform family, but they do appear to have morphological features that distinguish them from Percoidei indet. 1, such as the position of the sulcus on the inner face and slightly different proportions between the length of the ostium and cauda.

Stratigraphic and geographic range in Alabama

All of the specimens assigned to Percoidei indet. 2 were recovered from the “upper” Lisbon Formation at site ACh-8. Bartonian, zones NP16 and NP17.

Perciformes indet.

Material examined

UNITED STATES OF AMERICA – Alabama • 7 otoliths; WSU CC 469.4, WSU CC 472.2, WSU CC 472.3, WSU CC 472.4, WSU CC 474.1, WSU CC 474.2, WSU CC. 475.2.

Description

Sulcus distinctly divided (heterosulcoid), with wider ostium but much narrower cauda. Cauda appears to be of uniform width, bent ventrally. Ostium appears to be widened ventrally.

Remarks

The features described above are characteristic of the Perciformes , but they display very plesiomorphic perciform features. Juvenile specimens could not be assigned to a specific family. Due to their very small size and plesiomorphic nature of the specimens, we cannot determine if they represent species identified above or something different.

Stratigraphic and geographic range in Alabama

All specimens assigned to Perciformes indet. were recovered from the “upper” Lisbon Formation at site ACh-8. Bartonian, zones NP16 and NP17.