Giesbrecht, 1888
Females: Ur relatively longer, Pr:Ur = 3.6-4.0. Ce is evenly rounded without any dorsal hump. More characters can be accessed by backtracking the key:
Page 712
Males: P4 Exp3 with more than 10-12, usually about 15-20 teeth on distal part of segment. More characters can be accessed by backtracking the key:
Page 1199: Copepoda: Genus Acrocalanus males