Phidiana hiltoni O'Donoghue, 1927, is a species of sea slug, an aolid nudibranch, a shell-less marine gastropod mollusk in the family Glaucidae.
This species has a rather narrow range of distribution, being found from the central California coast to Baja California, Mexico
, and it is also found in the Gulf of Mexico
This nudibranch grows to 50 mm, or a little more than 2 inches in length. The reddish or brownish line across its head is almost always present, and is very characteristic of the species.
This species can be confused with Hermissenda crassicornis, which is superficially similar in appearance.
This aolid nudibranch species is considered to be rather aggressive, often biting and fighting with other nudibranchs, including members of its own species.
Pacific Coast Nudibranchs, 1980, Dave Behrens, Sea Challenger Books, California
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