Family Colloniidae, Phasianellidae,
Anatomidae & Eucyclidae
This page last revised: 5-25-2019
Click on photo to enlarge. Scale line in photo equals 1cm unless otherwise specified.
* Species which are commonly encountered on the beach.
Colloniidae Victoria, BC
Homalopoma baculum (Carpenter, 1864)
Berry Dwarf Turban
intertidal size to 5mm
northern Mexico to southern BC
tiny species is infrequently found. The shell may be
pinkish-brown to gray. It is nearly smooth with fine spiral
Barkley Sound, BC Ucluelet, BC, juveniles with white bands Slip Point, WA, intertidalHomalopoma luridum (Dall, 1885)Dwarf Turbanintertidal
to subtidal northern Mexico to
southern Alaska size to 10mm
small species is infrequently found. It is commonly found under
rocks in shallow water. The shell may be reddish to brown in
color. It has distinct spiral cords.
(synonyms - Homalopoma carpenteri)
Phasianellidae Ucluelet, BCEulithidium pulloides (Carpenter, 1865)Sullied Pheasantintertidal northern Mexico to southern BC size to 5mm
tiny species is infrequently found due to its size. The shell may
be pinkish gray and is sometimes patterned. It is found among
(previous name - Tricolia pulloides)
Marrowstone Island, WA, intertidalTricolia n. sp.intertidal Washington to BC? size to 4mm
is a new species of Tricolia which is in the process of being formally
described. It has been found intertidally among seaweeds.
Those found have been dark greenish-black to gray in color.
See article on the discovery of this species here.
Anatomidae offshore WA coast, ex pisce
Anatoma kelseyi (Dall, 1905)
subtidal, 100-2200m size to 3.5mm
northern Mexico to Alaska; Japan; West Indies to Arctic Seas; Europe
tiny shell is white with an open slit on the body whorl. Two
sharp spiral ridges circle the whorls. Our specimen was found ex
pisce - in the stomach of Sole.
(previous name - Scissurella kelseyi)
Eucyclidae offshore WA coast
Bathybembix bairdii (Dall, 1889)Baird's Top Shellsubtidal, 10-1200m Chile to northern Alaska size to 50mmThis
is infrequently seen even by divers because it prefers the deeper
waters. It has a thin, olive-green periostracum and rather
(previous namse - Lischkeia bairdii, Turcicula bairdii)
San Juan Islands, WA
Cidarina cidaris (Carpenter, 1864)
subtidal, 35-300m size to 40mm
northern Mexico to central Alaska
This deep water shell has distinctive beading on its ribs and less bulbous body whorls than B. bairdii. It is also less fragile.
(previous names - Bathybembix cidaris, Lischkeia cidaris, Margarita cidaris)