Fluminicola nuttallianus (I. Lea 1838)

Fluminicola nuttallianus (Lea, 1838)

Paludina nuttalliana Lea, 1838:101, pl. XXIII: fig. 89 [lectotype: USNM 121467, selected herein; type locality: Wahlamat (sic) (River), near its junction with the Columbia River].—Frauenfeld, 1864:630.—Hannibal, 1912:187 [as synonym of F. virens].

Leptoxis nuttaliana [sic].—Haldeman. 1847:6, pl. 5: fig. 156 [in part].—Brot, 1862:25 [in part].

Leptoxis nuttalliana.—Binney, 1859:12; 1860:11.

Amnicola nuttalliana.—W. Cooper, 1860:374.—Frauenfeld, 1863b:1029.—Grasset, 1884:92.

Anculotus nuttalii [sic].—Reeve, 1860–1861:[11; species 46] [in part]. Fluminicola nuttallii [sic].—Carpenter, 1864:676 [in part], Fluminicola nuttalliana.—Carpenter, 1864:598.—Binney, 1865:89–91 [in part].—Stimpson, 1865a:53; 1865b:54.—J.G. Cooper, 1867:30.—Tryon. 1870:65, pl. 17: fig. 17 [in part].—Paetel, 1883:71.—Römer, 1891:66.—Pilsbry, 1899a:123 [in part].—Orcutt 1901a:35 [in part]; 1902?:61 [in part].—Dall, 1905:119 [in part].—Walker, 1918:32.—Henderson, 1929:168 [in part].—Morrison, 1940:125.—La Rocque. 1953:270 [in part].—Burch and Tottenham, 1980:102, fig. 142.—Turgeon et al., 1988:61.

Paludina nutalliana [sic].—Anonymous, 1866:272.

Fluminicola nuttalli [sic].—Schmeltz, 1874:103.—Hemphill, 1881:8.

Fluminicola nuttaliana [sic].—Wenz, 1939:576.

Lithoglyphus nuttallianus.—Taylor, 1975a: 132.

DIAGNOSIS.—Large with broadly conical to globose shell; animal unknown.

The shell of this apparently extinct species closely resembles that of larger specimens of F. coloradensis, but it is thicker and has a narrower columellar swelling and more consistently reduced umbilicus.

DESCRIPTION.—Shell (Figure 13A) broadly conical to globose, with very short spire; height 8.5–10.0 mm; whorls 4.25–4.5. Protoconch (Figure 6F) of 1.5 whorls; diameter about 0.92 mm; microsculpture of numerous, strong, anastomosing spiral striae. Teleoconch whorls highly convex, with very broad, flattened sutural shelf; whorls broadest below midpoint. Microsculpture of collabral growth lines. Periostracum tan. Shell opaque, grey white. Aperture large, broadly lunate, rounded below, angled above. Outer lip strongly prosocline, thin. Parietal lip complete, thin, adnate. Columellar lip of medium thickness, columellar swelling narrow to moderate. Shell anomphalous or with small, chink-like umbilicus.

DISTRIBUTION.—Known with certainty only from the type locality area, near the mouth of the Willamette River (Figure 14). We have been unable to locate the Hartford, Oregon, site, although it may refer to Hanford, Washington, which is well upstream from the mouth of the Willamette, on the Columbia River.

MATERIAL EXAMINED.—West Coast, ANSP 365331.

OREGON. UF 88670. Hartford (?), USNM 47874 (mixed with Fluminicola sp.). Willamette (River), ANSP 27771. Wahlamette [sic], Oregon, USNM 121467 (lectotype), USNM 860648 (paralectotypes).

Fluminicola nuttallianus, common name dusky pebblesnail, is a possibly extinct species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Lithoglyphidae.

Fluminicola nuttallianus is the type species of the genus Fluminicola.