Abstract

Six new species of deep-sea cytheracean Ostracoda are described from the southwestern Pacific and eastern IndianOceans. The new species are Abyssobythere inequivalva, Cytheropteron anisovalva, C. dorsocorrugatum, C. lumalatum, C. parapulcinella and C. lobatulum. These species possess a hollow expansion of the shell above the hinge, forming a linear keel in all except in the latter species which has a laterally drooping dorsal lobe. We observe in some species that there is internal communication between the dorsal keel space and the interior of the duplicature. This suggests that the space has a particular function; various possible advantages inherent in the possession of such structures, including controlled buoyancy, are discussed.

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