Eutawichthys

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 : 18-19

EUTAWICHTHYS STRINGERI SCHWARZHANS, HUDDLESTON,

AND TAKEUCHI, 2018b

EUTAWICHTHYS CF. E. STRINGERI

FIG. 8F

Material— 48 specimens, specimen figured, DMNH 2021-09- 28 .

Description and Remarks— The specimens assigned to Eutawichthys stringeri are characterized by an anterior margin with a broad, dorsally shifted rostrum, a broadly rounded dorsal margin, a broadly rounded posterior margin, and a moderately deep, gently and regularly curved convex ventral margin. The inner face is slightly convex with a shallow, moderately wide sulcus divided into an ostium and cauda. The ostium is curved upwards towards the dorsal margin of the rostrum. The cauda is about the same length as the ostium and is oriented upwards. The cauda has a rounded tip that ends well before the posterior margin.

Excellent figures of the ontogeny of E. stringeri are found in Schwarzhans et al. (2018b) and readily illustrate the differences between it and other species of Eutawichthys . The distribution of E. stringeri is not nearly as widespread as E. maastrichtiensis and E. zideki . It has only been previously reported from the Woodbury Formation (early–middle Campanian) of New Jersey ( Stringer et al. 2016) and the Eutaw Formation (upper Santonian) of Alabama ( Schwarzhans et al. 2018b), where it represents the most abundant species.

Figures

Figure 8. Otoliths from the Cretaceous Arkadelphia Formation. All specimens unless otherwise noted are inner views of right sagittae. Lapilli are macular views. Length in mm. A. Palaeogadus cf. P. weltoni Schwarzhans and Stringer (2020a), DMNH 2021-09- 23, 1.46 mm. B. Gadiformes indeterminate, DMNH 2021-09-24, 1.56 mm. C. Tippaha mythica Schwarzhans and Stringer (2020a), DMNH 2021-09-25, 3.85 mm. D. Eutawichthys maastrichtiensis Nolf and Stringer (1996), DMNH 2021-09-26, 3.93 mm. E. Eutawichthys zideki Nolf and Stringer (1996), DMNH 2021-09-27, 1.42 mm. F.Eutawichthys cf. E. stringeri Schwarzhans, Huddleston, and Takeuchi (2018b), DMNH 2021-09-28, 1.85 mm. G. Ampheristus cf. A. americanus Schwarzhans and Stringer (2020a), DMNH 2021-09-29, 1.58 mm. H. Protobythities brzobohatyi Schwarzhans (2010), DMNH 2021-09-30, 1.68 mm. I. Lapillus type 1, DMNH 2021-09-31, 2.98 mm.