Crepidula perforans (Valenciennes, 1846)
Common name(s): Western white slipper shell, Western white slipper snail
|Synonyms: Crepidula williamsi|
|Crepidula perforans attached inside the aperture of a whelk shell which is occupied by a hermit crab|
|(Photo by: Dave Cowles, July 2005)|
How to Distinguish from Similar Species: Crepidula nummaria has a yellow-brown periostracum. Crepidula fornicata has the apex to the side. Few other species besides this one live inside gastropod shells with hermit crabs.
Geographical Range: Vancouver Island to Baja California
Depth Range: Almost completely subtidal in Puget Sound
Habitat: Occasionally on rock, often inside apertures of shells, inside holes of rock-boring clams.
Biology/Natural History: In Alaska, is sometimes found on the operculum of the Oregon (hairy) triton, Fusitron oregonensis. Crepidula nummaria may be synonymous with this species. The systematics needs to be worked out better. The females brood their young, which can distinguish this species from C. nummaria.
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Morris et al., 1980
O'Clair and O'Clair, 1998
Ricketts et al., 1985
A shelf occupies the anterior portion of the shell. Scale below is cm with mm marks. Photo by Dave Cowles July 2005