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22a. Caudal ramus 3 times as long as wide.  Right antennule, 3rd segment from distal end with long slender process.

Leptodiaptomus sicilis

22b. Caudal ramus 1.5 times as long as wide.  Right antennule, 3rd segment from distal end, with hooked process.

Leptodiaptomus siciloides