Electronic field guide to AQUATIC MACROINVERTEBRATES of SMALL STREAMS in Eastern Massachusetts
Antennae flattened and paddle-like, widest at base; body usually no more than 1.5 centimeters in length
Stylogomphus
Antennae flattened and paddle-like, widest at mid-point; body usually no more than 1.5 centimeters in length; found in small, shaded, spring-fed streams
Lanthus
Antennae cylindrical, not flattened; abdomen much longer than wide; larvae may reach 3 cm in length.
Gomphus
Abdomen long and tapered, last segment (10) much longer than wide in top view; larvae may reach 4 cm in length; found in large, slow-moving streams and old mill ponds
Arigomphus
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