New species of Halicyclops (Copepoda Cyclopidae) from the United States of America.

Rocha C.E. 1 & Hakenkamp C.C. 2
Hydrobiologia, 259: 145-156



Two new species of Halicyclops, H. reidae and H. maculatus, are described from the groundwater and marsh sediment of Wye Island, Maryland. Halicyclops maculatus is the first species of the genus to show sexual dimorphism in the males consisting of digitiform seate on the endopodite of swimming legs 1 and 2. Halicyclops reidae is the only American species of the genus having the inner distal seta of the leg 4 endopodite 3 plumose and the proximal seta spiniform.

A key for identification of the Halicyclops species from North America is provided.



1. Departamento de Zoologia, Instituto de Biociencias Universidade de Sao Paulo
Caixa Postal 20520 01498 Sao Paulo (Brazil);
e-mail: cefrocha@usp.br

2. Department of Zoology, University of Maryland
College Park, Maryland 20742 4415 USA


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