Costasiella formicaria (Baba, 1959)
|Maximum size: ( )
animal has a cream body frosted with dusky gray and flecked
with white. The gray pigment is densest on the edges of the rhinophores
and head but varies in intensity and distribution. In all animals, it
forms a transverse line just behind the closely spaced eye spots. The
branches of the digestive gland in the cerata range from olive green to
golden brown, again with variation in intensity. (Note 1)
formicaria is a rare species known from three animals found in
protected to moderately exposed locations. The one Maui animal came
a moderately exposed rocky area at 3-7 m (10-28 ft). Its cerata are
Maui, Oahu and Midway: also known from Japan.
It was first
recorded in Hawaii from Kaneohe Bay, Oahu by Terry Gosliner.
Midway Atoll; May 30, 1993.
Observations and comments:
1: There's some chance that the unusual color shown in the "dark" image may be due to fading of the slide or other photographic artifact rather than to differences in the animal.