Eocypraea takeosusukii, 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 : 26-27

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.13887889
persistent identifier	https://treatment.plazi.org/id/921FD94C-FFC8-FFB4-FC04-FA29FE6DFBCF
treatment provided by	Felipe
scientific name	Eocypraea takeosusukii
status

Treatment

EOCYPRAEA TAKEOSUSUKII GROVES, 2011 View in CoL

FIGS. 8D–F View Figure 8

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

Eocypraea (Eocypraea) takeosusukii Groves, 2011 . p. 46 ( Table 1 View Table 1 ), 48, 49, figs. 3, 4. Groves and Squires, 2021. p. 232.

Eocypraea takeosusukii Groves. Fehse, 2021 View in CoL . p. 42.

Holotype and Type Locality— LACMIP 7045.1 , LAC- MIP Type 13645 ( Figs. 8D–F View Figure 8 ), length 18.8 mm, width 14.4 mm, height 11.2 mm. LACMIP Locality 7045 (ex CIT Locality 1589), “Martinez Formation” (Thanetian Stage), east end of Lower Lake , Lake County, northern California.

Occurrence— Late Paleocene, “Martinez Formation,” Lower Lake area , Lake County, northern California .

Etymology— Originally named for the late Takeo Susuki [1920-2006] ( UCLA, Earth and Space Sciences Department).

Description— Shell small/medium size. Shell constricted anteriorly. Dorsum highly arched, maximum height and maximum width near center. Aperture slightly s-shaped, widens anteriorly, curves sharply toward columella posteriorly. Denticulation semi-coarse with smooth interstices: outer lip with 16 teeth, inner lip with 11 teeth. Fossula smooth, wide. Posterior columella highly inflated. Anterior canal missing. Posterior canal deep. Anterior and posterior basal ridges slight and do not form basal calluses. Base rounded. (Groves 2011: p. 49).

Remarks— The holotype is the only known specimen, and its preservation is moderately good. A poorly preserved specimen from LACMIP Locality 7047 [ex CIT Locality 868], Lower Lake area, Lake County, northern California ( LACMIP 7047.74, Type LACMIP 14929). “Martinez Formation” may be this species. This fauna contains Turritella infragranulata Gabb, 1864 , in the Herndon Creek area, Lower Lake, Lake County, northern California ( Stanton 1896) and Saul (1983: p. 102) confirmed Stanton’s (1896) report of this turritellid and assigned it to the Thanetian Stage.

References

Figures

Figure 8A–C. Eocypraea novasumma (Nelson, 1925), Santa Susana Formation (Paleocene, Thanetian Stage), Runkle Canyon, north side Simi Hills, Ventura County, southern California. Basal (A), dorsal (B), and right-labral (C) views, 3.2x, length 17 mm, width 11.6 mm, height 9.3 mm, of holotype UCMP 30499, UCMP Locality 4776. D–F. Eocypraea takeosusukii Groves, 2011, “Martinez” Formation (Paleocene, Thanetian), Lower Lake area, Lake County, northern California. Basal (D), dorsal (E), and left-lateral (columellar) views, 2.6x, length 18.8 mm, width 14.4 mm, height 11.2 mm, of holotype LACMIP 7045.1, LACMIP Type 13645, LACMIP Locality 7045 [ex CIT Locality 1580]. G–I. Eocypraea sp., cf. E. inflata (Lamarck, 1802), “Domengine Formation” (Eocene, “Domen- gine Stage”), Reef Ridge, Kings County, central California. Basal (G), dorsal (H), and right (labral) (I) views, 1.8x, length 26 mm, width 17.7 mm, height 13 mm, of hypotype UCMP 15815, Locality UCMP A-1282. J–L. Eocypraea sp. Lodo Formation (basal part) (Paleocene, Thanetian Stage), Tumey Hills, Fresno County, central California. Basal (J), dorsal (K), and right (labral) (L) views, 1.5x, length 33 mm, width 21.5 mm, height 19 mm, of hypotype CASG 61666.04 [ex LSJU 10236], CASG Locality 61666 [ex LSJU Locality 2073; = UCMP Locality A-9717]. M–P. Grovesia castacensis (Stewart, 1926 [1927]), Tejon Formation (Eocene, “Tejon Stage”), Tehachapi Mountains, Kern County, southern California. Basal (M), dorsal (N), and left (columellar) (O) views, 4.5x, length 12.2 mm, width 7.8 mm, height 5.9 mm, of holotype UCMP 11690, Grapevine Canyon, UCMP Locality 452. Basal (P) view, 3.4x, length 15.5 mm, width 9.1 mm, height 6.9 mm, of hypotype LACMIP 41206.2, LACMIP Type 14941, base of Metralla Sandstone Member, Live Oak Canyon, LACMIP Locality 41206.