Megaloptera

Order Megaloptera (Hellgrammite, Fishfly and Alderfly) 
Courtesy of the Cacapon InstituteHead and thorax has thick hardened skin, while the abdomen has thin soft skin; prominent chewing mouthparts project in front of the head; no wing pads on the thorax; three pairs of segmented legs attach to the thorax; seven or eight pairs of stout tapering filaments extend from the abdomen; end of the abdomen has either a pair of prolegs with two claws on each proleg, or a single long tapering filament with no prolegs. 

1.

Corydalidae (Hellgrammite): Elongate dorsally flattened body; large jaws on the head, projecting forward; first eight abdominal segments and segment ten with paired lateral filaments; gill-tufts beneath/beside the filaments; abdomen terminates in fleshy appendages bearing hooks. Clinger/crawler; Predator; M-VL (L)(F) [Adult]

2.

Chauliodinae (Fishfly): Elongate dorsally flattened body; large jaws on the head, projecting forward; first eight abdominal segments and segment ten with paired lateral filaments; no gill-tufts; abdomen terminates in fleshy appendages bearing hooks. Clinger/crawler; Predator; M-L (L)(F) [Adult]

3.

Sialidae (Alderfly): Elongate dorsally flattened body; large jaws on the head, projecting forward; first seven abdominal segments and segment ten with paired lateral filaments; abdomen terminates into a single long hairy filament. Crawler/burrower; Predator; S-L (M)(S/F) [Adult]

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