Gibbula multicolor

Gibbula multicolor
	Drawing of a shell of Gibbula multicolor
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Clade:	Vetigastropoda
Order:	Trochida
Superfamily:	Trochoidea
Family:	Trochidae
Genus:	Gibbula
Species:	G. multicolor
Binomial name
	Gibbula multicolor; (Krauss, 1848) [1]
Synonyms[2]
	Cynisca rufanensis Turton, 1932; Gibbula becki Turton, 1932; Gibbula distincta Turton, 1932; Gibbula fucata Gould, 1861; Gibbula fucata var. sowerbyi Turton, 1932; Gibbula hera Turton, 1932 (invalid: junior homonym of Gibbula hera Bartsch, 1915); Gibbula lauta Turton, 1932; Gibbula lauta var. jucunda Turton, 1932; Gibbula lauta var. pretiosa Turton, 1932; Gibbula multicolor f. hera Turton, 1932; Gibbula ornata Turton, 1932; Gibbula polychroma Turton, 1932; Gibbula pulchella Turton, 1932; Stomatella biporcata A. Adams, 1850; Trochus multicolor Krauss, 1848 (original description);

Gibbula multicolor, common name the multicoloured topshell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.[2]

Description

The height of the shell attains 6½ mm, its diameter 7 mm. The small, narrowly perforated shell has a conoidal shape with five whorls. The first is whitish-rosy, the following white, with reddish flammules and spots of green and bluish, especially at the ridges. The surface of the whorls is marked with very fine spiral and vertical striae, and 2 elevated carinae. The body whorl contains three keels. The base of the shell is red with a spiral series of green streaks, concentrically striate. The aperture is suboval and smooth within. The columella is white.[3]

(Description of Gibbula fucata) The height of the shell attains 5.6 mm, its diameter 7.3 mm. The elevated shell has a helicoid shape. Its apex is red, the rest variously spotted, streaked and blotched with Indian red, pale yellow, light green and brown. The 2½ nuclear whorls are well rounded and smooth. The postnuclear whorls are marked by four, very strong, rounded, equal, and equally spaced, spiral cords, of which the first is at the summit and the fourth at the periphery. On the last turn the cord at the summit becomes obsolete. In addition to the spiral sculpture the whorls are marked by very retractively slanting, closely spaced lines of growth. The periphery of the body whorl is rendered decidedly angulated by the spiral cord. The base of the shell is short, well rounded, marked on the posterior fourth by six, narrow, flattened, spiral bands and between these and the umbilical chink by seven additional bands of about double the width of the former. The umbilicus is covered with a white callus. The aperture is subcircular and very oblique. The outer lip is thin at the edge and thick within. The columella is strong and decidedly curved. The parietal wall is covered by a moderately thick callus.[4]

Distribution

This marine species occurs off the southern coast of South Africa.

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References

Krauss, Die Südaf Moll., p. 97, t. 5, f. 31.
Gibbula multicolor (Krauss, 1848). Retrieved through: World Register of Marine Species on 1 May 2010.
Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
P. Bartsch (1915), Report on the Turton collection of South African marine mollusks, with additional notes on other South African shells contained in the United States National Museum; Bulletin of the United States National Museum v. 91 (1915)

Kilburn, R.N. & Rippey, E. (1982) Sea Shells of Southern Africa. Macmillan South Africa, Johannesburg, xi + 249 pp. page(s): 41
Steyn, D.G. & Lussi, M. (1998) Marine Shells of South Africa. An Illustrated Collector’s Guide to Beached Shells. Ekogilde Publishers, Hartebeespoort, South Africa, ii + 264 pp. page(s): 20
Branch, G.M. et al. (2002). Two Oceans. 5th impression. David Philip, Cate Town & Johannesburg
Herbert D.G. (2015). An annotated catalogue and bibliography of the taxonomy, synonymy and distribution of the Recent Vetigastropoda of South Africa (Mollusca). Zootaxa. 4049(1): 1–98

External links

Gastropods.com: Gibbula multicolor$

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[1] Krauss, Die Südaf Moll., p. 97, t. 5, f. 31.

[WoRMS-2] Gibbula multicolor (Krauss, 1848). Retrieved through: World Register of Marine Species on 1 May 2010.

[3] Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia

[4] P. Bartsch (1915), Report on the Turton collection of South African marine mollusks, with additional notes on other South African shells contained in the United States National Museum; Bulletin of the United States National Museum v. 91 (1915)