Epitonium sexcostum
(Jousseaume, 1912)
Description:
Dimensions range from 11 mm - 19.75 mm high and 6 mm - 13.73 mm wide.
Width to height ratio: 0.55:1 ~ 0.7:1
Shell: stocky, pear-shaped appearance with a conical apex; strong; small. Exterior colour white, smooth. About 9 whorls, rapidly increasing, separated; protoconch with ~3 whorls partially broken; teleoconch with ~6 whorls convex, separated. Imperforate. Approximately 6 costae on the body whorl. Costae are thin, erect, slightly wing like. Costae crowned with a triangular spiny projection near the suture; slightly reflected; varices align and fuse in oblique longitudinal series, partially wrapping around the spire. Intercostal spaces smooth. Aperture sub-round, oblique.
Distribution:
Red Sea [Jousseaume, 1912:199]; Tanzania [Thiele, 1925:137]; Indo Pacific, Australia QLD south as far as Moreton Bay [Wilson, 1993:279]
Habitat:
not reported.
Etymology:
from sex [latin] = six and costatum = ribbed, referring to the shell consistently having six ribs on the body whorl
Type Material:
Syntype: MNHN 4321, 4337, 4338 (syntypes). [as Turbiniscala sexcosta Jousseaume, 1912:] - Type Locality: Suez, Périm.. [Brown, L. & Neville, B.D., 2015]
MNHN (2025g).
Muséum national d
Distribution
as listed in source literature
Jousseaume, F. (1912).
Plate V. Fig. 48-49.
Turbiniscala sexcosta sp. n.
pp: 199.
original description
Kaicher, S.D. (1981).
Card #: EP2-3032.
Syntype Paris Museum
Wilson, B.R. (1993).
pp: 379. Fig. 26.
MNHN (2025g).