Giesbrecht, 1888
Females: A1 exceeds end of CR by 5-6 terminal segments. P4 Exp3 with 15-20 fine teeth. More characters can be accessed by backtracking the key:
Page 711
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