Electronic field guide to AQUATIC MACROINVERTEBRATES of SMALL STREAMS in Eastern Massachusetts
First thoracic segment covered with large, hard plate (sclerite), second and third segments soft
LEVEL IV
First two thoracic segments covered on topside with large plate-like sclerites, third segment soft, often with small sclerites
LEVEL IV
All three thoracic segments covered on topside with large plate-like sclerites
HYDROPSYCHIDAE
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