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MURCHISONELLIDAE


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Koloonella moniliformis (Hedley & Musson, 1891)

Description: Shell minute, very elongate and narrow, variable in width (Fig. 3), spire rounded or straight-sided, up to 8 whorls. Protoconch (Fig. 2) of 1 planar whorl, set on teleoconch with axis inclined at 70 to teleoconch axis. Teleoconch whorls strongly rounded, smooth. Aperture elongate-ovate, outer lip thin; columella smooth, without plaits. Shell colourless tranparent becoming opaque with age.

Size: Up to 4 mm in length.

Distribution: Endemic to Australia: Hervey Bay, Qld, southwards and around southern Australia, to south-western WA, including Tas.

Habitat: Empty shells are common in beach washup. Laseron (1951, p. 325) said "We found it abundantly in the lagoon at Dee Why, living in the sand at the roots of reeds and grass at the edge of the water".

Comparison: Koloonella capricornia Laseron, 1959, described from Moreton Bay and Darwin, is similar to this species. Laseron (1959) remarked, comparing it to K. moniliformis, "it is similar in form, size and protoconch but has uniformly flatter whorls".

Figs 1, 2: Balmoral Beach, Middle Harbour, Sydney (C.344793).

Fig. 3: Cronulla, Sydney, NSW (C.344786).

 

Copyright Des Beechey 2017