A pair of pontoniine shrimps, representing an undescribed species of a new genus, Ctenopontonia cyphastreophila, are described and illustrated. The specimens are remarkable for the pectinate armament of the orbital margin and the absence of flagellate exopods on the maxillipeds.
They appear most closely related to the species of Pontonides Borradaile. They are associates of the faviid coral Cyphastrea microphthalma (Lam.) and inhabit a small network of fissures on the surface of the host's skeleton, a feature that has not been reported with any other
shrimps. The specimens were obtained from shallow sublittoral water at Eniwetok Atoll, Marshall Islands.
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