FLATWORM

This creature is a terrestrial polyclad flatworm (possibly Geoplana sp.) Flatworms are simple invertebrates; the simplest of the worm groups. There are about 20,000 flatworm species in this group. Species are free living or parasitic. One well-known flatworms is the tapeworm. Flatworms are found in marine and fresh water.

(I thank Dr. Mark E. Siddall, Associate Curator, Division of Invertebrate Zoology at the American Museum of Natural History for this identification.)