Electronic field guide to AQUATIC MACROINVERTEBRATES of SMALL STREAMS in Eastern Massachusetts

No legs; body enclosed in a hard shell

Viviparid_thm.jpg
Musculium_thm.jpg

Molluscs
No legs (some have short, fleshy "false legs"); body usually soft and worm-like

Tipula_thm.jpg
Glossiphoniid_vent_thm.jpg

Flies, Leeches, and Flatworms
Six obvious jointed legs, each with one or two claws (legs may be hidden beneath body).

Boyeria_thm.jpg
Ancyronyx_thm.jpg
Cheumatopsyche_thm.jpg
Sialis_thm.jpg

Insects
More than six legs

Caecidotea_thm.jpg
Crangonyx_thm.jpg
Eylais_thm.jpg

Crustaceans, Mites, etc.
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