This small, white, delicate, fragile shell is elongate with a somewhat rostrate posterior, a smooth shiny exterior and an internal ligament. A distinctive rib on the interior shell surface may be observed through the almost transparent shell. Shell up to 15 mm across.
This introduced species can be an indicator for eutrophic and anoxic conditions in sediment. It is endemic to the north-west Pacific Ocean including Japan and its distribution now includes California, USA and New Zealand. The first Australian record appears in the 1950s in Port Phillip Bay under a different name. This species is now well established throughout southern Australia.
Usually in muddy sediments, from low tide to depth of 50 m.
North-western Pacific, USA, New Zealand, and southern Australia.
Introduced to Australia
- DSE Advisory List : Not listed
- EPBC Act 1999 : Not listed
- IUCN Red List : Not listed