young, 5 mm
Doris pecten Collingwood,
|Maximum size: 22 mm.
is a blue species with about seven gills arranged in a semicircle.
There is a dorsal flap covering the gill opening.
Doris pecten is a
common species found under rocks in the low intertidal at protected to
moderately exposed rocky sites. Occasionally, it may also be found
subtidally at more exposed sites to depths of 9 m (30 ft). It feeds on
the thin blue sponge, Terpios aploos (on which it's superbly camouflaged) and lays a
cream, spiral egg mass that hatches in five to seven days in the
laboratory. Often, paired animals may be found on their food sponge and
near egg masses. (Note 1)
Big Island, Maui, Oahu and Kauai: widely distributed in the
is the species listed as Doriopsis
pecten (Collingwood, 1881) in Kay, 1979, Kay & Young, 1969 and Bertsch & Johnson,
1981. The left hand animal in the bottom photo on page 35 of the latter
is actually Doris nucleola.
It was probably first reported from Hawaii in Pease, 1860 and is referenced in the text on page 182 in Edmondson, 1946.
8 mm; on food sponge: found by CP; Hekili Point, Maui; May 5, 1993.
Observations and comments:
1: As in many other dorids, pairs
of this species often include animals that vary greatly in size. Since
the testes develop first in young animals, the smaller animal initially
acts as a male until it becomes large enough to also begin laying eggs.