Abstract
The amphipod crustacean P. hystrix is shown by scanning electron microscopy gut-content analysis to eat the tissue of its sponge host H. ventilabrum and to swallow the sponge''s siliceous spicules whole. Mandibular molar processes are modified to manipulate the spicules without breakage. The upper lip has pores, possibly mucus-gland ducts, from which mucus secretion appears to coat the spicules prior to swallowing, thus preventing injury.

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