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16a. Leg 5 inner apex of endopod elongated into spinous process. Two seta on the outer margin of terminal segment of the endopod of legs 2-4.

Skistodiaptomus pygmaeus

16b. Leg 5 inner apex of endopod only slightly produced. Single seta on the outer margin of terminal segment of the endopod of legs 2-4.

Skistodiaptomus reighardi