unique bivalve species
has thin valves, nearly circular in outline. The right valve
cemented to the substrate (rock, wood, abalone shells, or
The right valve has a large hole in it near the hinge, through which
material cements the bivalve to the rock (photo).
The left valve has a dark muscle scar opposite the perforation in the
shell, and is otherwise polished inside and often bright iridescent
(probably from algae living within the shell). Flesh is
Diameter to 10 cm.
Pododesmus macroschisma (Gray,
Common name(s): Alaska
Jingle shell, Money shell,
Pearly monia, Rock oyster, Abalone jingle, Green false-jingle, Blister
shell, False Pacific jingle shell
Pododesmus cepio, Monia machroschisma
shell, with the top (left)
valve on left and bottom (right) valve on right.
by: Dave Cowles, August 2005)
How to Distinguish
There is no other local species similar to this. Oysters
shell to the substrate but they are much larger, have thick shells, and
do not have the hole in the shell through which a byssus
The rock scallop Hinnites gigantea is larger, has a
with no hole in it, and has a deep purple stain on the inside of the
near the hinge.
Bering Sea, Alaska
to Baja California; Chukchi Sea
Low intertidal to 90
Cemented to rocks, plastic,
or wood. Common on pilings
include the seastars Evasterias
troschelii and Orthasterias
koehleri. Dead shells of this species are
by boring sponges such as Cliona celata var californiana.
The name "jingle shell" comes from the fact that the
a pleasant jingling sound when struck together. People often
mobile chimes from them, using the handy byssal hole to hang them.
Pododesmus macrochisma is now an
species, different from
and Fairbanks, 1966
1987, 1996 (As Pododesmus cepio)
and Carlton, 1975 (As Pododesmus cepio)
1994 (as Pododesmus cepio)
and Laurent, 1979 (as Pododesmus cepio)
1987 (as Pododesmus cepio)
and Snook, 1955
1993 (as Pododesmus cepio)
and McConnaughey, 1985
1994 (As Pododesmus cepio)
1997 (As Pododesmus cepio)
and O'Clair, 1998
et al., 1985 (As Pododesmus cepio)
General Notes and
Observations: Locations, abundances,
These are very common shells attached to subtidal rocks
Island and Coffin Rocks.
This live specimen shows the living tissue inside
Here is a view of the right valve, with the byssus where it attaches
to the rock
Here is a whole live specimen, encrusted with barnacles and bryozoans.
Authors and Editors of Page:
Dave Cowles (2005): Created original page