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

Large, spike-like jaws (mandibles) are easily seen from above; body leathery, some with leg-like gills down the sides...

Sperchopsis_L_02_thm.jpg
Agabus_Larva_thm2.jpg
Sialis_thm.jpg

LEVEL III
Body covered with hard plates, usually somewhat rounded in top view...

Psephenus_thm.jpg
Macronychus_Adult_thm.jpg
Anacaena_Adult_thm.jpg
Elmid_Larva_thm.jpg

COLEOPTERA (Beetles)
Long, slender, segmented appendages at both ends (may be broken or missing); thorax usually with wingpads...

Prostoia_thm.jpg
Siphlonurus_thm.jpg
Acroneuria_thm.jpg
Stenonema_thm.jpg

EPHEMEROPTERA and PLECOPTERA (Mayflies and Stoneflies)
A large hinged and toothed "jaw" (labium) attached to underside of head; thorax usually with wingpads...

Aeshna_labium_thm.jpg
Cordulegaster_thm.jpg
Calopteryx_thm.jpg
Stylogomphus_thm.jpg

ODONATA (Dragonflies and Damselflies)
Head with a needle-like mouthpart that extends down and back; thorax usually with wings or wingpads, but some are wingless...

Mesovelia_02_thm.jpg
Microvelia_thm.jpg
Ranatra_thm.jpg

HEMIPTERA (True Bugs)
Body soft, white to yellowish, and worm-like, and usually with many fine finger-like gills attached to abdomen; often found inside a case constructed of silk with sand, tiny stones, shredded leaves, or wood...

Cheumatopsyche_thm.jpg
Psilotreta_thm.jpg
Pycnopsyche_thm.jpg
Polycentropus_thm.jpg

TRICHOPTERA (Caddisflies)
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