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19a. Right antennule, 3rd segment from distal end, with process.  Leg 5, left exopod inner process short, twice as long as wide.

Leptodiaptomus ashlandi

19b. Right antennule, 3rd segment from distal end, lacking process.  Leg 5, left exopod inner process long, more than 4 times as long and wide.

Onychodiaptomus birgei