Brachycythara biconica

Brachycythara biconica
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Clade:	Caenogastropoda
Clade:	Hypsogastropoda
Clade:	Neogastropoda
Superfamily:	Conoidea
Family:	Mangeliidae
Genus:	Brachycythara
Species:	B. biconica
Binomial name
	Brachycythara biconica; (C. B. Adams, 1850)
Synonyms[1]
	Mangelia biconica Adams C. B., 1850; Mangelia (Brachycythara) biconica (Adams C. B., 1850);

Brachycythara biconica, common name the biconic top turrid, is a species of very small sea snail, a marine gastropod mollusk in the family Mangeliidae.[1]

Description

The length of the shell varies between 4 mm and 6 mm.

(Original description) The shell has a biconic shape. Its color is whitish, with a narrow spiral band of brown at the summit of the whorls, which is darker between the ribs, and a similar wider band a little anterior to the periphery of the body whorl (or some specimens may be described as pale brown, with a spiral band of white on the periphery of the whorls, and as white anteriorly). The shell shows strong transverse rounded ribs, about nine on each whorl, and excessively fine spiral rather distant raised lines, which are obsolete on the summits of the ribs. The protoconch is acute. The spire has the outlines nearly rectilinear. It contains six whorls, subangular, with a moderately impressed suture. The aperture is narrow. The outer lip is often much thickened by the last rib. The sinus is near the upper extremity of the outer lip, rather large in old shells. The siphonal canal is short.[2]

Distribution

B. biconica can be found in Atlantic waters, ranging from the coast of North Carolina south to Brazil.;[3] in the Caribbean Sea, the Gulf of Mexico and the Lesser Antilles.

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References

Brachycythara biconica (C. B. Adams, 1850). Retrieved through: World Register of Marine Species on 8 August 2011.
Adams, C. B. 1850. Description of supposed new species of marine shells which inhabit Jamaica. Contributions to Conchology, 4: 56-68, 109-123
Tunnell, John W., Jr., Felder, Darryl L., & Earle, Sylvia A., eds. Gulf of Mexico Origin, Waters, and Biota, Volume 1: Biodiversity. Texas A&M University Press, 2009. 666.

Clench & Turner, 1950. The Western Atlantic marine mollusks described by C. B. Adams.
Rolán E. & Espinosa J. (1999). El complejo Brachycythara biconica (C. B. Adams, 1850) (Mollusca: Gastropoda: Turridae) en Cuba, con la descripción de una nueva especie. Bollettino Malacologico, 34(1-4): 43-49
Rosenberg, G., F. Moretzsohn, and E. F. García. 2009. Gastropoda (Mollusca) of the Gulf of Mexico, pp. 579–699 in Felder, D.L. and D.K. Camp (eds.), Gulf of Mexico–Origins, Waters, and Biota. Biodiversity. Texas A&M Press, College Station, Texas

External links

Tucker, J.K. 2004 Catalog of recent and fossil turrids (Mollusca: Gastropoda). Zootaxa 682:1-1295.
"Brachycythara biconica biconica". Gastropods.com. Retrieved 15 January 2019.
MNHN, Paris: Brachycythara biconica

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[WoRMS-1] Brachycythara biconica (C. B. Adams, 1850). Retrieved through: World Register of Marine Species on 8 August 2011.

[2] Adams, C. B. 1850. Description of supposed new species of marine shells which inhabit Jamaica. Contributions to Conchology, 4: 56-68, 109-123

[3] Tunnell, John W., Jr., Felder, Darryl L., & Earle, Sylvia A., eds. Gulf of Mexico Origin, Waters, and Biota, Volume 1: Biodiversity. Texas A&M University Press, 2009. 666.