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Displaying members of subgenus UmbonisPrevious | Next

Cerion (Umbonis) stevensoni Dall, 1900

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Synonymy

Cerion stevensoni Dall, 1900: 65; Pilsbry, 1902: 220, pl. 44, fig. 70-71; Dall, 1905b: 40; Clench, 1934: 209; Clench, 1937a: .23, pI. 3, fig. 8-10; Clench, 1940:12.

Cerion (Umbonis) stevensoni Clench & Aguayo, 1952: 435-436, pl. 53, fig. 1-3.

Original Description: Click to view

Geographic Distribution: Long Island, Bahama Islands.

Type Locality: Wemyss, Long Island, Bahamas [23° 25' N, 75° 10.75' W]

Dall (1900:65) originally published the species as coming from "Long or Berry Island," but subsequently (Dall, 1905:40) changed the type locality to Rum Cay, noting that "locality corrected by Stevenson in letter on file in archives."

Clench (1937:23) later confirmed the correct locality and confined the type locality to: Wemyss, 7 miles SE of Simms, Long Island, Bahamas.

Type Material: Holotype, USNM 107833

Types, U.S. Nat. Museum; specimens in Stearns' collection, Detroit Mich., and Mr. Stevenson's collection.

Additional Records

LI-4 Long Island, Bahama Islands [23° 25.473' N, 75° 10.567' W]. November 17, 1998

LI-22 Long Island, Bahama Islands [23° 25.895' N, 75° 10.406' W]. Gould, Goodfriend, Harasewych, Pappas, Villacampa, Carpintero December 6, 2001

LI-23 USNM 1002176, Long Island, Bahama Islands [23° 25.756' N, 75° 10.313' W]. Gould, Goodfriend, Harasewych, Pappas, Villacampa, Carpintero December 6, 2001

LI-42 Long Island, Bahama Islands [23° 25.497' N, 75° 10.132' W]. December 13, 2001

LI-56 Long Island, Bahama Islands [23° 25.698' N, 75° 10.267' W]. December 5, 2004

LI-57 Long Island, Bahama Islands [23° 25.999' N, 75° 10.465' W]. December 5, 2004

LI-58 Long Island, Bahama Islands [23° 26.203' N, 75° 10.203' W]. December 5, 2004

LI-59 Long Island, Bahama Islands [23° 25.699' N, 75° 10.267' W]. December 5, 2004

LI-60 Long Island, Bahama Islands [23° 25.467' N, 75° 10.094' W]. December 5, 2004

Remarks

Dall (1900) noted "The entire absence of the axial fold is notable" and regarded this species to be "related to the group of C. scalarinum Pfr., called Umbonis by Maynard." Clench (1934) considered it to be related to C. felis P & V.

This species, as presently understood, is limited to a 5 km portion along the northeastern coast of Long Island. Populations are patchy with considerable variation between populations.

Clench (1940:12) regarded this taxon to belong to the Group of Cerion scalarinum.

Additional Information

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