Eratopsis crescentensis, Weaver and Palmer, 1922, Weaver and Palmer, 1922

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 : 37-38

ERATOTRIVIA CRESCENTENSIS

( WEAVER AND PALMER, 1922)

FIGS. 10G–I

Eratopsis crescentensis Weaver and Palmer, 1922 . p. 36, 37, pl. 11, figs. 10, 22. Weaver, 1942 [1943]. p. 393, 645 (table), pl. 76, fig. 21.

Eratotrivia crescentensis (Weaver and Palmer) . Schilder, 1932. p. 81 [as E. crescentensis ]. Schilder, 1933. p. 276. Schilder, 1961. p. 149. Schilder and Schilder, 1971. p. 12, 108. Squires and Goedert, 1994. p. 16, 18, figs. 37, 38.

Holotype and Type Locality — CASG 7587 [ex UWBM 201 ] ( Figs. 10G–I ), length 6 mm, width 4 mm, height 3.5 mm. UWBM Locality 358, Crescent Formation , at Crescent Bay, Clallam County, northern Olympic Peninsula , Washington ( Weaver 1942 [1943]: p. 393).

Referred Specimens—Hypotype (of Squires and Goedert, 1994) LACMIP 16657.24 , LACMIP Type 12162 [not 12228, as reported by Squires and Goedert (1994: pp. 16, 18)], length 4.86 mm, width 3.55 mm, and two additional specimens, LACMIP 16657 [= LACMIP Locality 41553; ex CSUN Locality 1553], Crescent Formation, Little River area , Grays Harbor County, Washington. Two specimens ( LACMIP 41563.1 , LACMIP Type 14947) from LACMIP Locality 41563 [ex CSUN Locality 1563], Crescent Formation , Larch Mountain area , Black Hills , Thurston County, southwestern Washington and one specimen ( LACMIP 41553.1 , LACMIP Type 14948) from LACMIP Locality 41553 [ex CSUN Locality 1553], also from the Larch Mountain area , Black Hills , Thurston County, Washington. Hypotypes UWBM IP 98539 (two specimens) .

Occurrence— Lower Eocene, Washington. “Capay Stage”: Crescent Formation, Crescent Bay, Washington ( Weaver and Palmer 1922); Crescent Formation, Little River, Grays Harbor County, southern Olympic Peninsula, Washington ( Squires and Goedert 1994).

Etymology— Originally named for the Eocene Crescent Formation, Clallam County, northwestern Washington.

Description —Shell small and entirely covered with numerous oblique spiral ribs uniform in strength and extending into both lips; moderate convexity; posterior end flattish, anterior end protruding and tapered. Aperture moderately straight, widest just anterior to middle of shell. Outer lip inflated.

Remarks— Eratotrivia crescentensis is the only known trivid in the Paleogene deposits of the NEP region. Specimens are small and uncommon. They show reasonably good preservation.

Figures

Figure 10. A–C. Cypraedia sp. Bateque Formation (Eocene, “Capay Stage”), Mesa La Salina, Baja California Sur, México. Basal (A), dorsal (B), and right (labral) side (C) views, 2.3x, length 19.5 mm, width 13.2 mm, height 11.9 mm, of hypotype IGM 5057, LACMIP Locality 41220b [ex CSUN Locality 1220b]. D–F. Cypraeogemmula warnerae Effinger, 1938. “Gries Ranch beds,” Crescent Formation (upper part) (Eocene, “Capay Stage” to Galvinian Stage), Black Hills area, Washington. Basal (D) and dorsal (E) views, both 16x, and left (columellar) (F) view, 33x, of hypotype LACMIP 16655.37, LACMIP Type 11372, LACMIP Locality 16655 [= LACMIP Locality 41563; ex CSUN Locality 1563]. (continued on next page)