Colus griseus (Dall, 1890)
Common name(s): Gray whelk
|Synonyms: Plicifusus griseus|
|Colus griseus shell collected dead from a red octopus (Octopus rubescens) midden. Shell height is 1.5 cm, width 0.7 cm.|
|(Photo by: Dave Cowles, March 2008)|
How to Distinguish from Similar Species: Mohnia freilei, another rare subtidal species, has 12-15 axial ribs per whorl and only reaches 1.8 cm height.
Geographical Range: Pacific
Biology/Natural History: This is a rare subtidal species.
While Kozloff (1987, 1996) classify this species in
The American Fisheries Society (1998) and ITIS (2008) place it in
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American Fisheries Society, 1998
General Notes and
abundances, unusual behaviors:
I have not found this species near Rosario, but apparently red octopus have because this was in the beer bottle midden of a red octopus at about 18 m depth on Whidbey Island.
This photo shows the aperture. The shell has obviously been dead for awhile and has the remnants of a bryozoan growing within the aperture as well as some missing shell on the outer lip of the aperture.
Note how the axial ribs disappear on the anterior half of the body whorl, while the finer spiral ridges are still visible.