Family Eulimidae & Capulidae
Click on photo to enlarge. Scale line in photo equals 1cm unless otherwise specified.
* Species which are commonly encountered on the beach.
all photographed in Petersburg, AK, intertidally photographed on Black Sea Cucumber
found in anaerobic mudVitreolina columbiana (Bartsch, 1917)intertidal
to subtidal southern BC to southern
Alaska size to 10mm
occaionally found. It has a glossy, almost transparent shell
which is curved.. The color reflects what it has been eating since the shell is transparent. It is parasitic on
the Black Sea Cucumber.
(synonym - Balcis columbiana, Melanella columbiana)
Aclis shepardiana (Dall, 1919)
intertidal to at least 46m size to 4mm
southern California to southern BC
species is very rare to find due to its small size. The shell
is very small and slender. As one person described, it looks like "a tiny sliver of glass."
(previous name - Graphis shepardiana)
This page last revised: 5-25-2019
San Juan Islands, WA
Petersburg, AK, intertidal
Tacoma, WA, intertidal
Trichotropis cancellata Hinds, 1843
intertidal to 200m Oregon to northern Alaska size to 40mm
is occasionally found intertidally on a very low tide. It is
especially fond of the large tube worms. This white shell has a
checkered sculpture pattern and a hairy periostracum.
Trichotropis bicarinata (Sowerby, 1825)
subtidal, 10-475m size to 37mm
Arctic Ocean south to northern BC, Japan & Greenland
This shell has two strong spiral ridges on the body whorl.
It has a flaky periostracum which forms spiny looking rings.