Carapus smithvillensis Dante & Frizzell, 1965

Lin, Chien-Hsiang & Nolf, Dirk, 2022, Middle and late Eocene fish otoliths from the eastern and southern USA, European Journal of Taxonomy 814, pp. 1-122 : 48

Carapus smithvillensis Dante & Frizzell, 1965

Fig. 15L–M

“ Carapus ” smithvillensis Dante & Frizzell in Frizzell & Dante, 1965: 715, pl. 86 figs 32–33, 35, pl 87 figs 7–8.

Carapus smithvillensis – Schwarzhans 1981b: 113. — Nolf 1985: 64; 2013: 65, pl. 123.

Remarks

The otoliths are characterized by an enclosed and elongated sulcus, which is almost completely filled by a single, large colliculum. The features are almost identical to those of Recent otoliths of Carapus . The degree of extension in the posterior part and the thickness of the otoliths seem to vary intra-specifically, which can also be observed in other recent carapid species such as Echiodon dentatus ( Nolf 2013: pl. 122).

Stratigraphic and geographic distribution

Lutetian: Weches Formation and “Stone City beds”, Texas; “lower” Lisbon Formation, Alabama. Bartonian: “upper” Lisbon Formation, Alabama.

Figures

Fig. 15. Fish otoliths from the US middle and upper Eocene. A–D. Bregmaceros troelli (Dante & Frizzell, 1965). A–B. “Stone City beds”, Alabama Ferry on Trinity River, North, Texas (IRSNB P 10033–10034). C–D. Landrum M., Pin Oak Creek, Texas (IRSNB P 10035–10036). E–H. “Diretmus” serratus (Müller, 1999). E. “Stone City beds”, Stone City Bluff, Brazos River, sample 2 from bed P, Texas (IRSNB P 10037). F. “Stone City beds”, Alabama Ferry, on Trinity River, North, Texas (IRSNB P 10038). G–H. Wheelock M., Little Brazos River, Stenzel loc., Texas (IRSNB P 10039–10040). I–K. “Myripristis” cajun (Frizzell & Lamber, 1961). I. Wheelock M., Little Brazos River, Stenzel loc., Texas (IRSNB P 10041). J–K. “Stone City beds”, Stone City Bluff, Brazos River, Texas (IRSNB P 10042–10043). L–M. Carapus smithvillensis (Dante & Frizzell, 1965), “Stone City beds”, Alabama Ferry, on Trinity River, North, Texas (IRSNB P 10044–10045). 1 = ventral view; 2 = inner view. Scale bars = 1 mm.