Reid 1992. Redescription of Diacyclops nearcticus (Kiefer, 1934) and description of four similar new congeners from North America, with comments on D. crassicaudis (G.O. Sars, 1863) and D. crassicaudis var. brachycercus (Kiefer, 1927) (Crustacea: Copepoda). Canadian Journal of Zoology, 70(7) 1992: 1445-1469