This chiton has
a girdle with sparse but easily seen dorsal, slender, flexible hairs
are not as long as the girdle is wide. The branches of the
if present, come only from the proximal parts of the larger hairs (photo).
There are no large granules on the dorsal surface of the
There is a pronounced cleft in the posterior end of the girdle (see
above). The ventral surface of the girdle is not orange (photo).
Plates 2-7 have rows of tubercles. The lateral regions of
2-7 are separated from the central area by a slight, nearly smooth
or a series of slightly enlarged tubercles but not by a large ridge or
a series of enlarged, coalesced tubercles. May have very
lines on plates and the interior of the plates are white.
up to 10 cm.
hindsii (Sowerby in Reeve,
Common name(s): Hind's chiton
(Listed as Mopalia
hindsii feeding on
the sponge Myxilla
incrustans which is growing on the shell of the
|(Photo by: Dave Cowles,
How to Distinguish from
Similar Species: Mopalia
muscosa has dense, straplike hairs on the
lignosa has more hairs on the girdle and has no
of raised tubercles on the plates (but it does have pits), plus the
cleft in the girdle is absent or very small and the ventral girdle is
muscosa nor M.
lignosa has a prominent posterior cleft in the
ciliata does have a prominent posterior girdle cleft but
hairs are strap-shaped, have glassy spicules, and branch other than at
SE Alaska to
Ventura, CA. This species is said to be very common in
but is not often mentioned in guides to the Pacific Northwest.
Intertidal (and subtidal?)
Common intertidally under
rocks, both on outer coast and in bays.
feeds on filamentous algae, diatoms, polychaetes, amphipods, and
(and apparently on sponges). It is common on shaded pilings,
the valves are often overgrown by bryozoans, annelids, barnacles, and
The reproductive cycle is variable but in California it is mainly from
October to March. It does not brood its
young. It may
have the flatwormNexilis
symbiotic in its mantle cavity.
and Carlton, 1975
et al., 1980
and O'Clair, 1998
et al., 1985
General Notes and
abundances, unusual behaviors:
This larger view shows how the chiton is grazing the sponge
This closeup shows the detail on the plates, plus a view of some of
The anterior two plates of this individual have a lot of white.
This closeup of some of the sparse girdle hairs, along the lateral
margin of the girdle, shows how the larger hairs branch from the
The orange/pink background is the sponge and scallop that the chiton is
crawling on. Other than on these lateral areas and in some
along the edges of the plates the girdle hairs are quite sparse.
This closeup is of some girdle hairs which are not right at the margin
of the girdle.
The underside of the girdle of this species is not orange.
Authors and Editors of Page:
Dave Cowles (2008): Created original page
CSS coding for page developed by Jonathan Cowles (2007)