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Mesoginella sinapi (Laseron, 1948)

Diagnosis: Shell small, white or yellowish white, not strongly narrowed anteriorly; spire medium to high; aperture moderately narrow; lip smooth, moderately thickened internally, thickest centrally; external varix present; siphonal notch absent; posterior notch weak; ventral callus absent; columella with four strong plaits occupying half the aperture, 4th fold remote.

Size: Adults 2.5 3 mm in length.

Distribution: Australian Museum Collection: Port Stephens and Sydney Harbour , NSW; beach specimens and down to 15 metres.  Uncommon.

Comparison: This is the smallest species in the genus.

Fig. 1: Off Sow and Pigs Reef, Sydney Harbour (C.103360)

Copyright Des Beechey 2003