Zooplankton of the South Atlantic Ocean
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Zooplankton of the South Atlantic Ocean
Key: Step 1112. Copepoda: Family Mesaiokeratidae males

P1 Exp2 with outer spine. Left P5 penultimate segment (segment 4) with 19 thin comb-like spinules; 3-segmented on right, distal segment with 2 apical spines:

Mesaiokeras mikhailini

Mesaiokeras mikhailini

P1 Exp2 without outer spine. Left P5 without comb-like spinules on penultimate segment (segment 4); P5 1-segmented on right, tapering with 1 small internal spinule.

Step 1113
Decision path