Cerithium claviforme Schepman 1907

Cerithium claviforme Schepman, 1907

Cerithium claviforme Schepman, 1907:187–188, pl. 9: fig. 5, 5a [holotype: ZMA 3–06–003, 4 paratypes; type locality: Kajoe Ragi, Celebes, Indonesia: post-Tertiary].

DESCRIPTION.—Shell (Figure 28): Shell conical-ovate, solid, tapering, comprising 15 weakly inflated, knobby whorls and reaching 26.8 mm length and 12.8 mm width. Outline of early whorls slightly concave, becoming convex on central and adult whorls. Protoconch unknown. Early teleoconch whorls (Figure 28F) angulate, sculptured with strong, colabral, axial ribs and two spiral cords with broad subsutural ramp. Adult teleoconch sculptured with two adapical, major, spinose, beaded spiral cords, a thin presutural, beaded cord, and numerous spiral threads. Beads unite forming 11 or 12 axial plicae between major spiral cords, but usually not extending to suture on either side. Subsutural ramp marking limits of weak suture. Body whorl elongate, with varix opposite outer lip of aperture. Body whorl sculptured with four major beaded spiral cords; sometimes with weak central axial plications, and with numerous spiral threads, some enlarged and beaded. Shell base with weak siphonal constriction and numerous fine spiral threads. Aperture ovate, a little over one-third the shell length. Columella concave with slight columellar callus. Anterior siphonal canal short, turned slightly to left of shell axis. Anal canal well defined, marked by columellar parietal tooth extending well into shell aperture. Outer lip thickened at edge, enameled and nearly smooth, but with very weak crenulations and weak inner incised spiral lines. Shell color chestnut to light tan with white spirals, and darker brown spots on spiral cords. Beads white or brown. Anterior siphonal canal dark brown. Aperture and columella white to gold. Measurements (Table 15) Periostracum not evident. Operculum (Figure 28D) ovate, tan, paucispiral with eccentric nucleus, and with distinct attachment scar on obverse.

Radula (Figure 29): Type-1 radular ribbon (Figure 3A) short, one-ninth the shell length. Rachidian tooth (Figure 29B) triangular-square, with pair of posterior, lunule-shaped ridges and triangular posterior extension on basal plate. Cutting edge of rachidian with triangular, pointed main cusp flanked on each side by two small denticles. Lateral tooth (Figure 29A,B) having long posterior lateral extension and wide, long central buttress on basal plate. Cutting edge of lateral tooth with spade-shaped main cusp, one inner flanking denticle, and two outer flanking denticles. Marginal teeth (Figure 29A) with wide shafts and bases, and curved apices with blunt, spatulate tips. Inner marginal tooth with three inner flanking denticles and one outer flanking denticle. Outer marginal tooth same, but lacking outer flanking denticle.

Anatomy: Preserved animal cream colored with dusky gray, transverse lines and blotches. Mantle edge with long papillae and with very deep, inhalant siphonal notch creating posterior fold on left side of mande. Mantle cavity organs typical of cerithiids, but anterior osphradium not separated from ctenidium near mantle edge. Palliai gonoducts unknown.

SYNONYMIC

Cerithium claviforme is a species of sea snail, a marine gastropod mollusk in the family Cerithiidae.