Cronia aurantiaca (Hombron and Jacquinot, 1853)
Description: Shell solid, with about 8 broad, low, axial folds, crossed by fine, crowded, heavily scaled spiral ribs, forming a black or dark brown background. Five larger white or fawn spiral ribs encircle the body whorl; one at the suture, one on the shoulder. Outer lip toothed, columella smooth; aperture white or light orange. Operculum brown, corneous.
Size: Average length 25 mm, maximum 40 mm.
Distribution: Central and western Pacific. In Australia, from north-western Australia, through NT and Qld, to Shellharbour, NSW.
Habitat: Under rocks, often in a slightly muddy environment, from the intertidal down to about 10 m (Coleman 1975). Common.
Synonyms: Purpura pseudamygdala Hedley 1903; Purpura amygdala Kiener,1835 is very similar and may be the same species.
Fig. 1,2: Long Reef, Collaroy, NSW (C.077328)
Copyright Des Beechey 2000