What is the star system?
The star system calculates the number of pieces that were handled by Conchology, Inc. in the last 21 years:
| 0 – 5 pieces | 6 stars |
|
| 6 – 10 pieces | 5 stars |
|
| 11 - 25 pieces | 4 stars | |
| 26 - 75 pieces | 3 stars | |
| 76 - 150 pieces | 2 stars | |
| > 150 pieces | 1 star | |
We want to point out that the star system is only very reliable for PHILIPPINE shells only, as we handle very few foreign shells in general. As time goes, the system will become more and more performant.
Cerion stevensoni Pilsbry, 1902: 220, pl. 44, fig. 70-71
Cerion stevensoni Dall, 1905b: 40
Cerion stevensoni Clench, 1934: 209
Cerion stevensoni Clench, 1937a: .23, pI. 3, fig. 8-10
Cerion (Umbonis) stevensoni Clench & Aguayo, 1952: 435-436, pl. 53, fig. 1-3
Cerion stevensoni Clench, 1940:12
[23° 13' N, -75° 7' 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.
Types, U.S. Nat. Museum; specimens in Stearns' collection, Detroit Mich., and Mr. Stevenson's collection.
LI-22 [23° 25.89' N, -75° 10.41' W]. Gould, Goodfriend, Harasewych, Pappas, Villacampa, Carpintero December 6, 2001
LI-23 USNM 1002176 [23° 25.76' N, -75° 10.31' W]. Gould, Goodfriend, Harasewych, Pappas, Villacampa, Carpintero December 6, 2001
LI-42 [23° 25.5' N, -75° 10.13' W]. December 13, 2001
LI-56 [23° 25.7' N, -75° 10.27' W]. December 5, 2004
LI-57 [23° 26' N, -75° 10.47' W]. December 5, 2004
LI-58 [23° 26.2' N, -75° 10.2' W]. December 5, 2004
LI-59 [23° 25.7' N, -75° 10.27' W]. December 5, 2004
LI-60 [23° 25.47' N, -75° 10.09' W]. December 5, 2004
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.