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

No gills on abdominal segment 1; first set of gills (on abdominal segment 2) operculate, covering the other gills.CAENIDAE

Caenis_thm.jpg
Caenis

No gills on abdominal segments 1 to 3; first set of gills (on segment 4) operculate, covering part or all of the other gills.

Eurylophella_thm.jpg
Eurylophella_02_thm.jpg

EPHEMERELLIDAE
Gills appear long and sharply pointed; most gills deeply forked, appearing doubled.LEPTOPHLEBIIDAE

Leptophlebia_thm.jpg
Leptophlebia

Head and body wide and flattened, eyes located on top of head; last pair of gills narrow and pointed, projecting out from each side near rear of abdomen.HEPTAGENIIDAE

Stenonema_02_thm.jpg
Stenonema_thm.jpg
Stenonema
Gills appear small and rounded, with a dark band along the side margins.AMELETIDAE

Ameletus_02_thm.jpg
Ameletus

Gills rounded, with darkened centralized veins.SIPHLONURIDAE

Siphlonurus_thm.jpg
Siphlonurus
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