Cef. Darocha et Cc. Hakenkamp, NEW SPECIES OF HALICYCLOPS (COPEPODA, CYCLOPIDAE) FROM THE UNITED-STATES-OF-AMERICA, Hydrobiologia, 259(3), 1993, pp. 145-156
Two new species of Halicyclops, H. reidae and H. maculatus, are descri
bed from the groundwater and marsh sediment of Wye Island, Maryland. H
alicyclops maculatus is the first species of the genus to show sexual
dimorphism in the males consisting of digitiform setae on the endopodi
te of swimming legs 1 and 2. Halicyclops reidae is the only American s
pecies of the genus having the inner distal seta of the leg 4 endopodi
te 3 plumose and the proximal seta spiniform. A key for identification
of the Halicyclops species from North America is provided.