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Molluscs of Tasmania

Cystiscidae – Cystiscinae: Cystiscus alternans (Pritchard & Gatliff, 1899) (‘alternating margin-shell’)

Synonym(s): alternans Pritchard & Gatliff, 1899 multiplicata Tate & May, 1900.

Typical shell-length 2.0 mm. Lives in offshore waters under rocks and stones. Native. Endemic to southeastern Australia (TAS, VIC and SA).


Class: Gastropoda
Subclass: Caenogastropoda – Sorbeoconcha
Order: Hypsogastropoda – Neogastropoda
Superfamily: Muricoidea
Family: Cystiscidae
Subfamily: Cystiscinae
Genus: Cystiscus

Localities for Cystiscus alternans
species image
locality map

no coastal locality records for this species currently available