Calyptraea fastigiata Gould, 1846
Common name(s): Cup-and-saucer snail, Pacific chinese hat snail
|Calyptraea fastigiata shell (dead) collected subtidally near Northwest Island|
|(Photo by: Dave Cowles, July 2005)|
How to Distinguish from Similar Species: Slipper shells such as Crepidula adunca have a septum inside but the shells are more flattened, and the septum also is mostly flat rather than spiral. The shells of chinese cap limpet Acmaea mitra has a similar shell shape but no septum inside.
Geographical Range: Alaska to California
Depth Range: Occasionally intertidal, mostly subtidal at 18 to 137 m
Habitat: Attached to rocks, dead shells, or sometimes to crabs
Biology/Natural History: As with other slipper shells, this species is a filter feeder with special gills.
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Inside the shell there is a spiral septum, or shelf, which twists about 1/2 revolution