Eucyclotoma, Boettger, 1895

Li, Baoquan & Li, Xinzheng, 2014, Report on the Raphitomidae Bellardi, 1875 (Mollusca: Gastropoda: Conoidea) from the China Seas, Journal of Natural History 48 (17), pp. 999-1025 : 1012-1013

Eucyclotoma sp.

( Figure 1H )

Material examined

Xisha Is. 1 spec, CN 58 M-1542-1, Shu Island (Xisha Is.), 3 May 1958 .

Description

Shell oblong, rather thick and solid, 12.9 mm in length, 5.6 in width and 5.9 in aperture, with wide, sinuous aperture, expanded basally, base of columella slightly foreshortened; siphonal canal wide, deep and rounded, not indented; suture distinct, narrow but deep. Outer lip thickened, with coarse nodules edge; anal sinus openly and widely concave, parietal pad thickening of outer lip. Overall sculpture of dense spiral ridges, rendered cancellate and granulose by crossing of even denser axial ribs, spiral ridges different in thickness, two to three stronger spiral ridges in penultimate whorls, about three fine spiral ridges in the interval of two stronger spiral ridges, while, six stronger spiral ridges in the body whorl, and three to five fine spiral whorls in interval zone; axial ribs dense, narrow, suture to suture, about 20 in later whorls. Whorls six, early whorls with sub-median angle by strong spiral ridges, body whorl evenly convex. Protoconch rounded, smooth. Off-white, stained with brown.

Distribution

Only known from Xisha Is., SCS, China.

Remarks

The species is very similar to Eucyclotoma varicifera (Pease, 1868) in shell profile and cancellate, granulose sculpture, but differs from the latter by the thicker shell, while the holotype of E. varicifera is thin and slightly translucent.

Figures

Figure 1. Species of familyRaphitomidae. (A) Asperdaphne paramoretonica sp. nov. (Holotype SCS, CN L72B-39); (B) Daphnella inangulata sp. nov. (Holotype locality, SCS); (C) Daphnella interrupta Pease, 1860 (SCS, CN 63M-253); (D) Daphnella cf. suluensis Schepman, 1913 (ESC, CN V520A); (E, F) Eucyclotoma cymatodes (Hervier 1897a) (Nansha Islands, CN 93NS8-3; Xisha Islands, CN 58M-1542); (G) Eucyclotoma tricarinata (Kiener 1840) (Xisha Islands, CN 58M-1642); (H) Eucyclotoma sp. (Xisha Islands, CN 58 M–1542–1).