Clypeomorus petrosa chemnitziana (Pilsbry 1901)

Clypeomorus petrosa chemnitziana (Pilsbry)

Cerithium variegatum Quoy and Giamard.—Sowerby, 1865, pl. 7: figs. 41a,b,c, [in part, fig. 41c is not Cerithium variegatum Quoy and Gaimard, 1834: is Clypeomorus petrosa chemnitziana (Pilsbry, 1901)].

Cerithium chemnitzianum Pilsbry, 1901:393, text fig. [holotype: ANSP 247576; type-locality: Loo Choo Islands].—Dance, 1974:66, text fig.

Clypeomorus chemnitzianus (Pilsbry).—Shirai, 1977:27.

DESCRIPTION.—Shell (Figure 36; Table 19): Adult shell turreted, pupiform having teleoconch of 10 whorls and apical angle of 38 degrees. Length/width index 2.16. Shell reaching 32 mm in length. Early whorls concave but most adult whorls are inflated. Postnuclear whorls and early whorls sculptured with 3 spiral beaded cords on which beads aligned to form axial riblets, presenting cancellate appearance. Adult whorls sculptured with 3 major, granose, spiral cords and numerous finer spiral lirae. Numerous tiny beads on spiral cords, about 23 per whorl, tend to coalesce. Beads on adult whorls not aligned to form axial riblets. Penultimate whorl sculptured with 3 or 4 major spiral, beaded cords and numerous finer spiral lirae. Early whorls usually eroded, protoconch unknown. Body whorl weakly sculptured with numerous finely beaded spiral cords, the 2 nearest the suture having the largest beads. Large dorsal varix of body whorl at a 45-degree angle to plane of aperture when shell viewed anteriorly. Suture deeply incised, somewhat wavy. Aperture ovate, a little less than one-third the shell length. Apertural characters similar to those of nominate subspecies, but outer lip more rounded, smoother, and less angulate where it joins penultimate whorl. Shell color white to yellow, densely dotted with rich brown spots or lines on the spiral cords. Larger maculations of brown or tan or wide brown bands may be present. Aperture and columella white. Periostracum light brown. Operculum as in nominate subspecies.

Radula (Figure 33a,c,f; Table 20): Radula essentially like that of typical subspecies. Radular ribbon a little over one-sixth the shell length, with approximately 65 rows of teeth. Shell length/radula length index 5.90.

Animal: Color of head and foot whitish, with pink and black dots and larger pink maculations. Mantle edge bright yellow.