How to Distinguish from Similar Species: Distinguished by location, color, and that it is broader than long.
Geographical Range: Alaska to Baja California.
Depth Range: It is found in the low intertidal zone but is more commonly subtidal to at least a depth of 1,800 m in clean, quiet water.
Habitat: This species is scarce, but when found, is usually attached to undersides or protected surfaces of large rocks.
History: The animal
is solitary. When it reproduces, the fertilized eggs develop
a characteristic, but nameless, larva. The larva does not
is planktonic. The larva attaches and then develops into an
The main predators of this species appear to be crabs, which chip off
of the margin of the shell to reach the soft part. The
may survive these attacks and many show asymmetrical shell growth from
repairs that have been made.
Authors and Editors of Page:
Anna Dyer (2002): Created original page
Edited by Hans Helmstetler 11-2002; Dave Cowles 2005