Genartina, FRIZZELL AND DANTE, 1965

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

GENARTINA FRIZZELL AND DANTE, 1965

GENARTINA SP. 1 ( SENSU SCHWARZHANS AND STRINGER,

2020a)

FIG. 5D

Material— one specimen, DMNH 2021-09- 04 .

Description and Remarks— The one specimen attributed to the fossil otolith-based Genartina is similar to Genartina sp. 1 reported and illustrated by Schwarzhans and Stringer (2020a). The specimen is high-bodied, somewhat discoid in shape (sensu Smale et al. 1995), thin and flat, a gentle and deeply curved ventral margin, and a short, pointed rostrum (which is often broken). The sulcus is slightly dorsal with a much longer, tapering cauda and a somewhat oval ostium. The Arkadelphia specimen resembles G. abbatiae ( Stinton, 1965) from the European Paleocene and early Eocene (see under “ Harpadontina ” abbatiae in Nolf 2013, pl. 58). The specimen also somewhat resembles G. texana Dante and Frizzell (1965) described from the Eocene of the USA Gulf Coastal Plain ( Frizzell and Dante 1965). Schwarzhans and Stringer (2020) noted that Genartina has a relatively large stratigraphic range from Late Cretaceous (Santonian) to middle Eocene (Bartonian). Its taxonomic assignment has been greatly debated and included the Osteoglossiformes Regan (1909) ( Frizzell and Dante 1965), Osmeridae Forey(1973) ( Nolf1985), Elopiformes (including Albuliformes ) in Schwarzhans (2003, 2012), Harpodontidae Bleeker (1875) ( Nolf 2013), Synodontidae Gill (1861) ( Stringer et al. 2016), and Stomiiformes Fink and Weitzmann (1982) ( Schwarzhans et al. 2018b). Schwarzhans and Stringer (2020a) proposed that Genartina probably belongs to an extinct family and order of bony fishes and placed it after the Albuliformes .

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.