Flatworms in Colorado

Planaria are found in ponds, in this case one of the ponds at the Fountain Creek Nature Center, on 20 August 2008. This one was about 1/4" long when he was stretched out.

Kingdom: Animalia
Subkingdom: Eumetazoa
Superphylum: Platyzoa
Phylum: Platyhelminthes
Class: Turbellaria
Order: Seriata
Suborder: Tricladida
Family: Planariidae