Eocypraea crescentensis, GROVES, 2011

Groves, Lindsey & Squires, Richard L., 2023, Revision of northeast Pacific Paleogene cypraeoidean gastropods, including recognition of three new species: implications for paleobiogeographic distribution and faunal turnover, PaleoBios 40 (10), pp. 1-52 : 23

EOCYPRAEA CRESCENTENSIS GROVES, 2011

FIGS. 7G–I

Eocypraea (Eocypraea) n. sp. 2 (in part). Groves, 1997. p. 7 [as E. (E.) n. sp. 2].

Eocypraea (Eocypraea) crescentensis Groves, 2011 . p. 46 (table 1), 49, 50, figs. 7, 8.

Grovesia crescentensis (Groves) . Fehse, 2021. p. 44.

Holotype and Type Locality— LACMIP 16655.40 , LACMIP Type 13646 (Figs. 7G–I), 10.9 mm in length, 7.6 mm in width, and 6.1 mm in height. LACMIP Local- ity 16655 [= LACMIP Locality 41563; ex CSUN Locality 1563], Crescent Formation , Larch Mountain area , Black Hills , Thurston County, southwestern Washington.

Referred Specimens— A poorly preserved topotypic internal mold (7.8 mm in length, 5.6 mm in width, and 4.3 mm in height), and three small fragments [ LACMIP Locality 16655] also exist.

Occurrence— Lower Eocene , “Capay Stage,” south- western Washington .

Etymology— Originally named for the Eocene Cres- cent Formation, Thurston County, western Washington.

Description— Shell small, moderately inflated, con- stricted anteriorly. Dorsal surface exhibits linear pattern which could represent growth lines. Aperture wide and very slightly s-shaped. Denticulation coarse with smooth interstices: outer lip with 14 teeth, inner lip with 6 teeth. Anterior and posterior canals shallow. Anterior and pos- terior basal ridges reduced forming a slight columellar basal callus; slight posterior spiral sulcus present; base rounded (Groves, 2011: p. 49).

Remarks— This rare species has finer dentition than the other NEP species of this genus and poorer preserva- tion of its apertural area.