Electronic field guide to AQUATIC MACROINVERTEBRATES of SMALL STREAMS in Eastern Massachusetts
Body completely flat; head somewhat triangular, with light-colored eyespots on top PLATYHELMINTHES (Flatworms)
Dugesia
Head retractable, or not easily distinguished from body; abdomen often tipped with fleshy lobes and/or gills at rear end
LEVEL III
Head capsule not retractable, easily distinguished from body
LEVEL III
Body tough and leathery; head not distinguishable except for large suction-disc mouth
HIRUDINA (Leeches)
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