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Cirsonella lata (Laseron, 1954)

Description: Figured syntype (Figs. 1, 2): Shell minute, spire somewhat raised. Protoconch low, smooth, with well-defined transition to teleoconch. Teleoconch of 3 whorls, smooth except for irregular growth lines. Umbilicus open, narrow, closed by reflected inner lip at top, apparently without spiral sculpture. Aperture with peristome incomplete, outer lip thin and broken, inner lip reflected over umbilicus. Shell colourless transparent.

Size: Figured syntype 1.4 mm high, 1.3 mm wide.

Distribution: Type locality Sydney, Manly, Ocean Beach, NSW.

Habitat: Syntypes from beach washup.

Comparison: This is distinguished by the incomplete peristome, a feature that makes its placement in the Skeneidae doubtful.

Remarks: There are a few specimens in the Australian Museum collection that closely match this species, and many others that are not an exact match but are close in form and size. The limits of the species in terms of shell morphology and geographical distribution are unknown.

Figs. 1, 2: SYNTYPE of Conicella lata Laseron, 1954. Manly Ocean Beach, Sydney, NSW


Copyright Des Beechey 2009