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_thm.jpg
Dugesia

Head retractable, or not easily distinguished from body; abdomen often tipped with fleshy lobes and/or gills at rear end

Pedicia_thm.jpg

LEVEL III
Head capsule not retractable, easily distinguished from body

Chironomid_thm.jpg
Nemotelus_03_thm.jpg

LEVEL III
Body tough and leathery; head not distinguishable except for large suction-disc mouth

Erpobdellid_thm.jpg
Glossiphoniid_vent_thm.jpg

HIRUDINA (Leeches)
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