Austroginella johnstoni (Petterd, 1884)
Diagnosis: Shell medium in size; white to pale yellowish; strongly narrowed anteriorly; spire medium height with shouldered whorls; weak nodule or axial fold on body whorl just before varix; aperture moderately broad; lip smooth, rapidly thickening posteriorly with a well defined posterior notch, bordered by a parietal nodule; external varix present; siphonal notch present; heavy ventral callus; columella with four strong plaits occupying half or more than half of the aperture.
Size: Adults 6-9 mm in length.
species is very similar to A.
muscaria, but is smaller; 6-9 mm compared to 10-16 mm for A. muscaria. The ventral
callus is heavier than in A.
muscaria, making the whole ventral surface of the shell almost flat
in very mature specimens. The
nodule or fold on the outside of the body whorl just before the varix is much weaker in
The habitat of the two species is similar.
Figs. 1,2: Collaroy Beach, Sydney (323678).
Copyright Des Beechey 2003