The symbiotic zoanthids of Puerto Rico are examined histologically and anatomically. The four known West Indian species, Parazoanthus tunicans, P. swiftii, P. Parasiticus, and P. catenularis, and two new species, P. puertoricense and Epizoanthus cutressi,
are described. The relationships between growth of zoanthid colonies with growth of their host sponges is examined, and other ecological notes are presented.
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