Genus Ilyocryptus

For morphological terms see: Cladocera Anatomy

The Genus Ilyocryptus is a group of very small waterfleas including just 3 Great Lakes species. Fine features of the postabdomen are used to distinguish among species - necessitating use of a high-powered light microscope at a minimum.

Anus on dorsal margin of postabdomen with 8 or more preanal spines. To 1.0mm.
Ilyocryptus sordidus