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

First set of antennae shorter than second pair; body with 2 or 3 conspicuous, sharp, rearward-pointing projections near posterior end.HYALELLIDAE

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Hyalella

Both pairs of antennae roughly equal in length; top (dorsum) of abdomen with tufts of small spines; extremely common, found in most perennial streams.GAMMARIDAE

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Gammarus
First set of antennae longer than second pair; no spines projecting from upper surface of abdomen.CRANGONYCTIDAE

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Crangonyx
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