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Cerithium phoxum R. B. Watson 1880

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Cerithium phoxum Watson, 1880

Cerithium phoxum Watson, 1880:106 [holotype and one paratype: BMNH 18872916634; type locality: Uvuka. Fiji, 22 m]; 1886:534–535, pl. 40: fig. 3.—Kobelt, 1893:143, pl, 28: figs. 4, 5.

Cerithium (Vertagui) phoxum Watson.—Tryon, 1887:148, pl. 28: fig. 59.

Cerithium baltealum Philippi—Cernohorsky. 1972:65, pl 14: fig. 5 [not C. balteatum Philippi, 1848; is C. phoxum Watson].

DESCRIPTION.—Shell (Figure 105A,G,I–L): Shell elongate, tapering and slender, comprising 13–15 nearly straight-sided whorls, and reaching 31.1 mm length and 9.2 mm width. Protoconch unknown. Early teleoconch whorls white, sculptured with two thin spiral lirae, and having broad subsutural ramp. Adult shell sculpture highly variable, consisting of weakly beaded spiral cords, spiral striae, 13–18 axial folds, and many wide varices. Teleoconch usually with 3 or 4 primary, weakly beaded, spiral cords per whorl, one thin spiral lira (sometimes several) in interspaces between dominant spirals, numerous fine spiral striae crossing 13–15 broad, colabral axial ribs, and with randomly distributed, large white varices. Axial ribs wavy where crossing spirals and forming fine cancellate pattern, especially on early teleoconch whorls. Beads usually weak and variable in number, sometimes nodular and pointed, especially on middle spirals, but sometimes absent Suture deeply impressed, slightly wavy, and overhung by each successive whorl. Body whorl narrow, sculptured with 5 or 6 occasionally weakly beaded, primary spiral cords, a thin spiral thread in each interspace, and with strong varix opposite outer lip of aperture. Two dominant cords at periphery of body whorl. Base of body whorl moderately excavated, sculptured with fine spiral striae; anterior siphonal canal moderately constricted. Aperture ovate, narrow, about one-fourth the shell length. Columella concave, thin, with distinct columellar lip. Anterior siphonal canal well developed, of moderate length, tubular, slightly twisted dorsally and to left of shell axis. Anal canal well developed, defined by strong parietal columellar tooth. Outer lip thickened, moderately crenulated having fine interior spiral striae. Shell color light tan, occasionally with faint brown blotches and spots on spiral bands. Spiral cords darker tan. Varices and aperture white. Measurements (Table 34). Periostracum thin, tan. Operculum (Figure 105H) brown, paucispiral, and with eccentric nucleus.

Radula (Figure 106): Type-1 radular ribbon (Figure 3A) short, about one-tenth the shell length. Rachidian tooth (Figure 106D) small, triangular, having narrow basal plate, and with central posterior projection flanked by narrow ridge on each side. Dorsal edge of rachidian tooth slightly concave; cutting edge with central, arrow-shaped cusp flanked on each side by two small denticles. Lateral tooth (Figure 106C,D) with long lateral basal projection and thick, posteriorly projecting, central buttress on basal plate; cutting edge with single inner denticle, large, pointed main cusp, and 2 or 3 small, pointed, outer denticles. Marginal teeth (Figure 106B–D) long curved, with hook-like tips serrated with small, rounded denticles. Inner marginal tooth with 3 inner denticles and 2 or 3 outer denticles. Outer marginal tooth same, but lacking outer denticles.

Anatomy (known only from single, dried specimen): Head-foot tan with black stripes and blotches across snout and sides of foot Mantle edge papillate. Buccal mass large with well-developed jaws. Rectum filled with cylindrical fecal pellets consisting of coarse sand.

SYNONYMIC
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bibliographic citation
Houbrick, Richard S. 1992. "Monograph of the genus Cerithium Bruguiere in the Indo-Pacific (Cerithiidae: Prosobranchia)." Smithsonian Contributions to Zoology. 1-211. https://doi.org/10.5479/si.00810282.510

Cerithium phoxum

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Cerithium phoxum is a species of sea snail, a marine gastropod mollusk in the family Cerithiidae.[1]

Description

Distribution

References

  1. ^ a b Cerithium phoxum Watson, 1880. Retrieved through: World Register of Marine Species on 17 May 2010.
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Cerithium phoxum: Brief Summary

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

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