Cranopsis cucullata (Gould, 1846)
Common name(s): Hood puncturella, Hooded puncturella, Helmet puncturella
|Synonyms: Puncturella cucullata|
|Cranopsis cucullata collected from a red octopus (Octopus rubescens) midden. Length 1 cm.|
|(Photo by: Dave Cowles March 2008)|
How to Distinguish from Similar Species: Puncturella. multistriata has about 30 primary ribs, each separated by 1-3 secondary ribs. The primary ribs do not project more than 1 mm beyond the shell margin. Puncturella galeata has no anterior seam, about 49-63 ribs, and only grows to 2 cm. Other keyhole limpets such as Diodora aspera and Fissurellidea bimaculata have a round opening at the apex instead of a slit in front.
Geographical Range: Alaska to Cabo San Qintin, Baja California
Depth Range: Low intertidal to 200 m; more common subtidally
Habitat: On and under rocks
Cranopsis was formerly considered to be a subset of Puncturella.
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American Fisheries Society, 1998
Morris, 1966 (as P. cucullata)
General Notes and Observations: Locations, abundances, unusual behaviors:
This closeup shows the anterior slit and the seam which leads from the slit to the anterior edge of the shell. This photo was made from a stack of photos which were combined by a computer algorithm to create a much greater depth of field (photo by Dave Cowles, technology by Keyence DHX-100 digital microscope and software)
The anterior slit is separated from the actual apex of the shell by a partition, as can be seen in this view of the underside.