Electronic field guide to AQUATIC MACROINVERTEBRATES of SMALL STREAMS in Eastern Massachusetts
Five pairs of legs; body flattened on top
ISOPODA
Five pairs of legs; body compressed from sides, shrimp-like.
AMPHIPODA (Scuds)
Five pairs of legs; body not compressed, but lobster-like; first pair of legs are "pincher" claws (may be broken or missing)
DECAPODA (Crayfish)
Four pairs of legs; body globose, sometimes bright red or blue
HYDRACHNIDIA (Water Mites)
Three pairs of true legs, followed by several pairs of gills that look like legs; front of head with a large pair of jaws (mandibles).
MEGALOPTERA
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