Epitonium tumidulum
(Thiele, 1930)
Description:
Dimensions range from 1.9 mm - 1.9 mm high and 1.3 mm wide.
Width to height ratio: 0.68:1 ~ 0.68:1
Shell: turbinate, broad conical; thin; microscopic. Exterior colour colourless. About 6 whorls; relatively large; protoconch with ~3 whorls smooth; teleoconch with ~3 whorls rapidly increasing, strongly convex whorls. Suture imperforate. Costae are dense, striae-like ribs. Intercostal spaces close, fine spiral threads. Base without a cord. Columella broad, somewhat concave. Aperture oval.
The unique specimen is a juvenile shell of uncertain species relationship. [Ponder, 1978]
Distribution:
NW Western Australia
Habitat:
sand with vegetation
Etymology:
[latin] from tumidulus, the diminutive form of tumidus = somewhat swollen, puffed up
Type Material:
Holotype: West Australian Museum reg. no. 67496 for Epitonium tumidulum (Thiele, 1930) - Locality: Station 3, ca 5 km NW of Denham, Sharks (= Shark) Bay, north-west Australia, 3 m, sand with rich vegetation (holotype) (reg. no. 67496). [Ponder, W. F., 1978]
Ponder, W. F. (1978). pp: 438. Fig. 1.
Holotype reg. no. 67496
Distribution
as listed in source literature
Ponder, W. F. (1978).
pp: 438. Fig. 1.
Holotype reg. no. 67496
