Stephopoma tricuspe Mörch, 1861
Description: Shell irregularly spiral, or contorted, surface with very coarse and irregular growth ridges. No longitudinal sculpture. No slit. Colour dirty white.
Size: Specimens available up to 30 mm, tube outside diameter 4 mm.
Distribution: Recorded only from Sydney Harbour.
Comparison: Distinguished within the family by absence of a longitudinal slit.
Remarks: There are only two lots of this species in the Australian Museum, both of which are figured here. Hedley (1913) gives a figure of the shells and operculum of specimens in the British Museum "perhaps types". Bieler (1997) discusses this species, and figures the protoconch and opercular bristles.
Fig. 1: Sydney Harbour, dredge Triton (C.407601)
Fig. 2: Port Jackson, NSW (C.407561)
Copyright Des Beechey 2007