Camptocercus, Camptocercus

Sinev, Artem Y., 2018, Genus Camptocercus (Cladocera: Anomopoda: Chydoridae) in North America, Zootaxa 4459 (3), pp. 583-599 : 595

Key for identification of North American species of Camptocercus .

1 Head and valves without developed dorsal keel................ Camptocercus oklahomensis Mackin, 1930. Central USA.

- Head and valves with developed dorsal keel................................................................2

2 Basal spine of postabdominal claw with maximum width at central portion. IDL seta 1 thick, curved, claw-like, longer than IDL seta 2.................................................. Camptocercus streletskayae Smirnov, 1998. Alaska.

- Basal spine of postabdominal claw with maximum width at the base. IDL seta 1 thin, almost straight, two times shorter than IDL seta 2.......................................................................................... 3

3 Basal pecten of the postabdominal claw consisting of 1–2 distal spines and over 15 densely spaced, thin spinules; distances between distalmost spines not exceed width of spine bases. Posteroventral angle of valves with 1–5 denticles................................................ Camptocercus rotundus Herrick, 1882. South Canada, North and South-East USA.

- Basal pecten of the postabdominal claw consisting of 2–3 large distal spines and about 5–7 smaller spinulae, distances between distalmost spines significantly exceed width of spine bases. Posteroventral angle of valves without denticles........................... Camptocercus dadayi Stingelin, 1913. South-East USA, Mexico, Central and South America.