Notodiaptomus nelsoni sp. n. male. AP4, P5, and Ur (100 µm), arrow points to the line of spinules on the distal margin of pediger 5, to the process at the basis of left P5, and to the exopodite 2 of right P5B Left P5 (20 µm), arrow points to the expansion in the basis of left P5C Detail of the conical process in the basis of left P5 (20 µm), arrow points to the expansion in the basis of left P5.