Watersipora arcuata, a New Species in the Subovoidea-Cucullata-Nigra Complex (Bryozoa, Cheilostomata)
Banta, William C.
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A new species, Watersipora arcuata, is proposed for the species usually identified as W. nigra Soule (1961), which differs from the holotype of Pachycleithonia nigra Canu and Bassler (1930) in its smaller size, an arcuate proximal border to the aperture, the distribution of interzoidal communication pores, possession of a basal window, and in other respects. A synonomy and detailed description of the species and its variations is given. The type locality is in San Diego, California.