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Molluscs of Tasmania

Pyramidellidae – Odostomiinae: Pseudorissoina perexigua (Tate & May, 1900) (‘tiny pyramid-shell’)

Synonym(s): perexigua Tate & May, 1900 minutissima Tenison-Woods, 1878.
Typical shell-length 2.3 mm. Lives subtidally and offshore as an internal parasite of sea-urchins. Native. Endemic to southeastern Australia (TAS, VIC and SA).


Class: Gastropoda
Subclass: Heterobranchia
Order: Lower Heterobranchia
Superfamily: Pyramidelloidea
Family: Pyramidellidae
Subfamily: Odostomiinae
Genus: Pseudorissoina

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