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Clanculus undatoides Tenison-Woods, 1879

Description: Whorls strongly shouldered just below suture, straight sided below angle. Sculptured with spiral rows of beads, variable in size from row to row, the upper row usually larger; 4-6 rows on penultimate whorl. Body whorl keeled with a beaded rib, 6-8 rows of beads above keel, 7-8 rows on base; base flat. Umbilicus open but shallow, umbilical margin smooth or weakly denticulate. Columella with a large tooth at upper quarter and another at lower quarter, with several weaker teeth below. Inside of outer lip lirate internally in mature shells. Colour white or fawn with beads in some rows alternating white and pink, especially on base.

Size: Up to 10 mm high.

Distribution: Endemic to Australia; Sydney, NSW, to eastern Vic.

Habitat: Subtidal, down to 143 m. Uncommon.

Synonyms: This species is probably conspecific with the shell described from SA as Clanculus philippi Koch, 1843 and that described from Victoria as Clanculus aloysii Tenison-Woods 1876. These are darker in colour with coarser sculpture than the NSW shell, but may be southern and western forms of a single species.

Figs. 1,2: Off Botany Bay, NSW, in 82 m (C.349852)