Cases of niche-partitioning and of habitat-segregation in pelagic marine calanoids of the genus Euchirella (Crustacea: Copepoda)

Two cases of apparent niche-partitioning and one case of alleged habitat-segregation in the calanoid copepod genus Euchirella are described. These are examined with regard to their possible implications for making generalizations about the structure of biocoenoses and about mechanisms of speciation in the pelagic marine environment.