Botryllophilus abbotti new species is fully described and illustrated from material collected from the Monterey Peninsula, California, on the eastern Pacific coast in 1979. The new species is associated with an unnamed compound ascidian (Archidisloma sp.) and the collection
includes the female and male. The present paper represents the first fully described and illustrated treatment of both sexes in a single species and proves a first step to solving many difficulties of species identification in most of the recorded species of the genus.
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