Vexillum exasperatum

Vexillum exasperatum, common name: the roughened mitre, is a species of small sea snail, marine gastropod mollusk in the family Costellariidae, the ribbed miters.^[1]

Vexillum exasperatum
Vexillum (Costellaria) exasperatum
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Family:	Costellariidae
Genus:	Vexillum
Species:	V. exasperatum
Binomial name
Vexillum exasperatum (Gmelin, 1791)
Synonyms[1]
Arenimitra michaelis Iredale, T. 1929 Mitra (Costellaria) exasperata (Gmelin, 1791) superseded combination Mitra (Costellaria) exasperata var. hadfieldi Melvill & Standen, 1895 Mitra arenosa Lamarck, 1811 Mitra corrugata Wood, S.V., 1828 Mitra exasperata (Gmelin, 1791) Mitra exasperata var. hadfieldi Melvill & Standen, 1895 Mitra torulosa Lamarck, J.B.P.A. de, 1811 Mitra tunicula Deshayes, G.P. in Cuvier, G.L.C.F.D., 1838 Mitra transenna Melvill, J.C., 1888 (taxon inquirendum) Vexillum (Costellaria) candida Dautzenberg, Ph. & J.L. Bouge, 1923 Turricula exasperata Gmelin Vexillum (Costellaria) angelettii Ferrario, 1995 Vexillum (Costellaria) exasperatum (Gmelin, 1791) · Vexillum (Costellaria) exusta Dautzenberg, Ph. & J.L. Bouge, 1923 Vexillum (Costellaria) hadfieldi Melvill, J.C. & R. Standen, 1895 Vexillum (Costellaria) michaelis Iredale, T., 1929 Voluta exasperata Gmelin, 1791

This species is sometimes spelled as Vexillum exasperata.^[2]

Description

The shell size varies between 10 mm and 29 mm.

(Described as Mitra (Costellaria) exasperata var. hadfieldi) The shell is turreted with a high spire. It contains seven whorls. The shell is eight or nine ribbed, differing from the type in being dark-brown, banded at the line of the sutures of the upper whorls, and also twice transversely banded at the body whorl. The outer lip shows nodulose striae. The columella has four plaits. Occasionally specimens occur wholly suffused with dark-brown.^[3]

Distribution

This species occurs in the Red Sea, in the Indian Ocean off Chagos Atoll, Madagascar, the Mascarene Basin and Tanzania, and in the Pacific Ocean off the Philippines, Fiji, New Caledonia and the Solomons Islands; also off Austrakia (Northern Territory, Queensland).