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10a. Caudal ramus with row of small spines along outer margin (female only) and usually more than four times as long as wide, total length usually > 0.7 mm.

Question 11

10b. Caudal ramus without row of small spines along lateral margin and less than four times as long as wide, total length usually < 0.6 mm.

Tropocyclops prasinus mexicanus