Anatomy and cnidae distinguish two species of deep-sea actinians
that produce coiled, chitinous shells inhabited by hermit crabs of the
genus Parapagurus. The actinian type species, Stylobates aeneus, first assigned
to the Mollusca, occurs around Hawaii and Guam with P. dofleini. Stylobates
cancrisocia, originally described as Isadamsia cancrisocia, occurs off east Africa
with P. trispinosus
