Key to the morphological structures of adult male diaptomids. A antero-lateral view of posterior end of prosome, urosome and caudal ramus from left side showing with left leg 5 (P5L) attached, illustrating characters A1 to A23 (Table 2) B right fifth leg (P5R), illustrating characters B1–10 (Table 2) C Right geniculate antennule (A1R) illustrating characters C1–11 (Table 2) D Basal part of fifth legs (P5), illustrating characters D1–8 (Table 2) E habitus in dorsal view, illustrating features of body tagmata and caudal rami (Table 2, characters E1–11) F Dorsal view of posterior margin of Ped4, showing row of spinules.