Diaphanosoma birgei n.sp. (Crustacea, Cladocera). A new species from America and its widely distributed subspecies Diaphanosoma birgei ssp. lacustris n.ssp.

The name Diaphanosoma leuchtenbergianum Fischer, 1854 is included in the synonymy of the species Diaphanosoma brachyurum (Liévin, 1848) and cannot be used as a valid name for the American populations of the genus. The populations described under this name have been identified as a new species, Diaphanosoma birgei n.sp., and populations from Europe, Asia, and Africa with conspecific characters as Diaphanosoma birgei ssp. lacustris n.ssp. A comparison with other species ocuring within the area of its distribution is given.