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Adelphotectonica reevei (Hanley, 1862)

Description: Shell moderately flat to moderately tall. Whorls weakly convex, sharply angled on periphery. Whorls sculptured with 3 nodulose spiral cords, 1 at top of whorls and 2 at bottom. Region between spiral cords crossed by oblique axial groves and often weak spiral grooves. Umbilicus widely open, from 2330% of base width; umbilical margin heavily toothed, bordered by a weak nodulose spiral cord. Remainder of base with very fine spiral threads, and several strong grooves beside periphery. Colour grey or fawn, with dorsal spiral cords alternating white and brown or sometimes unmarked white.

Size: Up to 30 mm in diameter.

Distribution: Australia, New Zealand and Kermadec Islands. In Australia, Fraser Island, Qld, southwards to Bass Strait.

Habitat: Subtidal, down to about 200 m; occasionally washed up on beaches. Fossil in Sydney Harbour. Common.

Comparison: This species differs from S. injussa by having two corded ribs at bottom of whorls.

Synonymy: Architectonica offlexa Iredale, 1931 is a previously recognised synonym.

Figs. 14:  Burrill Lake, S. of Ulladulla, NSW (C.157819).


Copyright Des Beechey 2016