Calliostoma quadricolor

Calliostoma quadricolor
Original drawing of a shell of Calliostoma quadricolor
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Vetigastropoda
Superfamily: Trochoidea
Family: Calliostomatidae
Subfamily: Calliostomatinae
Genus: Calliostoma
Species: C. quadricolor
Binomial name
Calliostoma quadricolor
Schepman, 1908

Calliostoma quadricolor is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.[1]

Some authors place this taxon in the subgenus Calliostoma (Fautor).

Description

(Original description by M.M. Schepman) The height of the shell attains 8½ mm. The imperforate shell has an elevated-conical shape, with slightly concave sides. It is yellowish, with a greenish tinge. The peripheral keel is articulated with white and rufous. The spire is purplish at the top. The 7 whorls are flat. The nucleus is nearly smooth, under the lens with a few rows of pits. The other whorls are covered with spirals, 2 on the upper whorls, increasing to 7 on the body whorl. These spirals are crossed by concentric ribs, connecting the spirals and producing beads in crossing them, the lowest, bicoloured spiral of each whoid is the strongest The beads on it become spiny, and form a conspicuous keel on the body whorl, it is double. The base of the shell is flat, with 13 unequal spirals, crossed by numerous radiating ribs, making them beaded. The aperture is rhombic. The upper margin is straight, the basal one slightly convex. The columella is cylindrical, slightly concave, angular at its junction with the basal margin. The outer wall is grooved interiorly by about 5 shallow grooves.[2]

Distribution

This marine species occurs off Papua New Guinea and in the Arafura Sea in the epipelagic zone.

References

External links

This article is issued from Wikipedia - version of the 11/23/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.