Electronic field guide to AQUATIC MACROINVERTEBRATES of SMALL STREAMS in Eastern Massachusetts
Outer part of "jaw" (labium) with three disctinct tooth-like lobes; gills thick, almost triangular in cross section.
Argia
Outer part of "jaw" (labium) with many small teeth; gills more or less flat.
Ischnura
Outer part of "jaw" (labium) with many small lobes or "teeth"; gills more or less flat.
Enallagma
Chromagrion
Chromagrion
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