all members of Class
Anopla, this nemertean worm has a mouth separate from the proboscis
both openings are on the ventral side of the head behind the brain, and
the proboscis has no stylets. Baseodiscus princeps
cephalic slits on the head but it does have many eyespots (photo) and
inconspicuous pair of oblique grooves on the head's anteroventral
Its color is a mostly homogeneous ochre to brownish dorsally and
yellow-ochre ventrally, with no longitudinal or annular
animal is highly contractile, and may be able to expand to longer than
Baseodiscus princeps (Coe, 1901)
Point, Padilla Bay, WA
Dave Cowles, July
How to Distinguish from
also uniformly orange or reddish but it has no eyespots nor
grooves. The description of this species sounds very much
of B. punnetti from farther south.
History: The animal
is able to contract its body in such a way as to form annular regular
along the body (photo).
It can contract its head entirely into its trunk.
General Notes and
abundances, unusual behaviors:
The head is lighter dorsally than is
the rest of the dorsum,
a line of dark eyespots around the border.
The underside is lighter than the
dorsum, as seen in this
view of an
The animal can constrict its muscles
to form annular
Authors and Editors of
Dave Cowles (2007): Created original page
Jonathan Cowles (2007): Updated page with CSS