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).
Classification
Class: Gastropoda
Subclass: Heterobranchia
Order: Lower Heterobranchia
Superfamily: Pyramidelloidea
Family: Pyramidellidae
Subfamily: Odostomiinae
Genus: Pseudorissoina
Localities for Pseudorissoina perexigua
Blackmans Bay
Bridport: beach
Clarke Island: Black Point
Flinders Island: Fotheringate Beach: southern end
Flinders Island: Killiecrankie: foreshore
Flinders Island: Leeka: foreshore towards Twelve Hour Point
Flinders Island: The Dock
Georges Bay: Blanche Point
King Island: Fitzmaurice Bay
Maria Island: Trigonia Corner
Orford: East Shelly Beach
Pirates Bay: near landing
Pirates Bay (unlocalised)
Port Davey: Whalers Cove
Seymour Beach: northern end
South coast of Tasmania (unlocalised)
Swanwick: foreshore
Taroona: Dixons Beach
