The subfamily Halicyclopinae presently encompasses six genera and more than 90 species, including surface and groundwater species, widely distributed in several kind of surface brackish water bodies, tidal pools, lagoonal and estuarine coasts, anchialine caves, sinkholes, interstitial and sandy beaches habitats, as well as ponds and marshes.

The genus Halicyclops Norman, 1903 is the most speciose, with 76 species and subspecies inhabiting coastal lagoons, anchialine caves and interstitial beach waters, around the World from 60 N to 45 S, approximately (Rocha et al., 2000).

Neocyclops Gurney, 1927 is represented by 7 species allocated to the subgenus Protoneocyclops Petkovski, 1986, 6 in the subgenus Neocyclops, and 3 species not yet ascribed to any of the 2 mentioned subgenera, because their males remain unknown (Petkovski, 1986).

Colpocyclops Monchenko, 1977, as well as Sergiosmirnovia Monchenko, 2007, each with 2 species, are restricted to the coastal area of the Ponto-Caspian region.

Recently, Rocha & Iliffe (1994) proposed the genus Troglocyclops to accommodate a very primitive halicyclopine from an anchialine cave on Eleuthera Island, Bahamas.

Rocha, Iliffe, Reid & Suarez-Morales (2000) described the genus Prehendocyclops, represented by 3 species, living together with Halicyclops cenoticola Rocha (Rocha & al. 1998), in cenotes from the peninsula of Mexico.

Halicyclops A. M. Norman 1903

Neocyclops Gurney 1927; Petkovski 1986

Troglocyclops Rocha & Iliffe 1994

Colpocyclops Monchenko 1977

Prehendocyclops Rocha, Iliffe, Reid & Suarez-Morales, 2000


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