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

Rear end has three long, paddle-like gills; antennae slender.

Ischnura_thm.jpg

COENAGRIONIDAE (Bluets, Forktails, and others)		Rear end has three long, paddle-like gills; first segment of antennae thicker and longer than second segment, giving the appearance of a pair of horns on front of head.CALOPTERYGIDAE (Broad-Winged Damselflies)

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Calopteryx
Rear end has no external gills; "jaw" (labium) more or less flat and hidden underneath head; antennae slender.

Aeshna_labium_thm.jpg
Boyeria_thm.jpg

AESHNIDAE (Darners)		Rear end has no external gills; "jaw" (labium) more or less flat and hidden underneath head; antennae short and thick, sometimes flattened

Lanthus_02_thm.jpg
Stylogomphus_thm.jpg

GOMPHIDAE (Clubtails)
Outer parts of "jaw" (labium) turned upwards, partially covering front of head; antennae slender.

Cordulegaster_thm.jpg
Didymops_thm.jpg

LEVEL IV
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