GRAPTOLITHOIDEA: Cephalodiscoidea
Cephalodiscus sp. (Hemichordata: Pterobranchia): observations of functional morphology,
behavior and occurence in shallow water around Bermuda
S.M. LESTER
Marine Biology 85 (1985), 263-268
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A pterobranch hemichordate, Cephalodiscus sp., was collected from Bermuda just below the
low-tide mark in July 1983 and again in October through December 1983. This is the third report
of this genus in shallow water and the second for the Western Hemisphere. Specimens were
observed alive in the laboratory. Colonies consist of zooids at various stages of development
arranged in clusters inside a translucent, collagenous coenecium. Cilia-driven currents of the zooids
are used in a method of filter-feeding similar to plylactolaemate bryozoans.