Fairy Shrimp, Water Fleas, etc. in Colorado

Daphnia, commonly called Water Fleas. These are less than 1mm in size, and were found on 31 August 2008 at the Fountain Creek Nature Center in Fountain, Colorado. The pictures were taken through a microscope at x100 power.

Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Branchiopoda
Order: Cladocera
Family: Daphniidae
Genus: Daphnia

Captured 8 October 2008, same place. This is a top view.