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

publication ID	https://doi.org/ 10.5070/P9401057774
publication LSID	lsid:zoobank.org:pub:11600574-2B0E-4C13-BC08-A3A5EF9EE562
DOI	https://doi.org/10.5281/zenodo.13887879
persistent identifier	https://treatment.plazi.org/id/921FD94C-FFCB-FFB0-FF6C-F8ADFBBFFB3F
treatment provided by	Felipe
scientific name	Eocypraea crescentensis
status

Treatment

EOCYPRAEA CRESCENTENSIS GROVES, 2011 View in CoL

FIGS. 7G–I View Figure 7

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 View Figure 7 ), 10.9 mm in length, 7.6 mm in width, and 6.1 mm in height. LACMIP Locality 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,” southwestern Washington.

Etymology— Originally named for the Eocene Crescent Formation, Thurston County, western Washington.

Description— Shell small, moderately inflated, constricted 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 posterior 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 preservation of its apertural area.

References

Figures

Figure 7A–C. Cypraeidae, genus and species indeterminate, Lodo Formation (basal) (Paleocene, Seldanian Stage), Tumey Hills, Fresno County, central California. Basal (A), dorsal (B), and right (labral) (C) views, 1.3x, length 39 mm, width 25 mm, height 22 mm, of hypotype CASG 61666.06, CASG Locality 61666. D–F. Eocypraea batequensis (Groves, 2011), Bateque Formation (Eocene, “Capay Stage”), Mesa La Salina, Baja California Sur, México. Basal (D), dorsal (E), and right (labral) (F) views, 4.8x, length 9.4 mm, width 6.5 mm, height 5.1 mm, of holotype IGM 5174, LACMIP Locality 16951 [ex CSUN Locality1220b]. G–I. Eocypraea crescentensis (Groves, 2011), Crescent Formation (Eocene, “Capay Stage”), Larch Mountain, Black Hills area, Thurston County, Washington. Basal (G), dorsal (H), and left (columellar) (I) views, 3.9x, length 10.9 mm, width 7.6 mm, height 6.1 mm, of holotype LACMIP 16655.40, LACMIP Type 13646, LACMIP Locality 16655 [= LACMIP Locality 41563; ex CSUN Locality 1563]. J–L. Eocypraea jimgoederti (Groves, 2011), lower McIntosh Formation (middle Eocene, “Transition Stage” to “Tejon Stage”), Doty Hills, Lewis County, Washington. Basal (J), dorsal (K), and left (columellar) side (L) views, 3.5x, length 12.7 mm, width 8.2 mm, height 6.9 mm, of holotype LACMIP 41573.1, LACMIP Type 13647, LACMIP Locality 41573 [ex CSUN Locality 1573]. M–O. Eocypraea judithsmithae n. sp., Llajas Formation (Eocene, “Domengine Stage”), north side Simi Valley, Ventura County, southern California. Basal (M), dorsal (N), and left (labral) (O) views, 1.5x, length 26.6 mm, width 18.4 mm, height 12.6 mm, of holotype LACMIP 40372.1, LACMIP Type 14940 (LACMIP Locality 40732).