Osmeroides undetermined

Stringer, Gary L. & Sloan, James Carson, 2023, First Cretaceous teleostean otolith assemblage (Arkadelphia Formation, upper Maastrichtian) from Arkansas, USA, early Gadiformes, and the Western Interior Seaway, PaleoBios 40 (1994), pp. 1-39 : 9

OSMEROIDES SP.

FIG. 5E

Material— three specimens, specimen figured, DMNH 2021-09- 05 .

Description and Remarks— The three small specimens assigned to Osmeroides are slightly oval shaped (sensu Smale et al. 1995) with a somewhat irregular dorsal margin and mostly smooth ventral margin. The dorsal field is much smaller than the ventral field. There is a heterosulcoid-type sulcus that is located primarily supramedially with a very slight downturn at the posterior of the slanted cauda. The inner face is convex, while the outer face is concave. The Arkadelphia specimens are similar to the Osmeroides sp. described and illustrated from the Ripley Formation in northeastern Mississippi by Stringer et al. (2020). Due to their small size and poor preservation, the assignment is tenuous, and a species determination is not possible.

Figures

Figure 5. Otoliths from the Cretaceous Arkadelphia Formation. All specimens unless otherwise noted are inner views of right sagittae. Length in mm. A. Elops sp., DMNH 2021-09-01, 1.89 mm. B. Albuliformes indeterminate, DMNH 2021-09-02, 1.42 mm. C. Elopothrissus sp. DMNH 2021-09-03, 1.83 mm. D. Genartina sp. DMNH 2021-09-04, 0.85 mm. E. Osmeroides sp. DMNH 2021-09-05, 3.85 mm. F. Anguilla? chickasawae Schwarzhans and Stringer (2020b), DMNH 2021-09-6, 1.90 mm. G. Echiophis aff. E. semisphaeroides Schwarzhans (2003), DMNH 2021-09-07, 3.25 mm. H. Muraenanguilla? sp. DMNH 2021-09-08, 2.18 mm.