“Aquatic Caterpillars, Snout Moths”
“Alderflies, Dobsonflies, and Fishflies”
“Dragonflies and Damselflies”
“Whirligig Beetle Larvae”
14 species in North America. Larvae are found in gravel along larger rivers generally near the shore.
Southeast: 5.5 and higher
Midwest: 3.7 and higher
Mid-Atlantic: 4 and higher
Engulfer / Predator
Lateral Gills USUALLY Absent
USUALLY 4-5-Segmented Legs
4 Posterior Hooks
5-Segmented Legs + Claws
Head with collar
+ Expanded Character List
Order: Larvae: Usually without lateral abdominal gills. If gills present, then 4 hooks clustered on segment 10. Thoracic legs each usually with 4 or 5 segments and with 1 or 2 claws; if without legs, head distinctly sclerotized and posterior body (thorax and abdomen) simple, without gills, hair brushes, suckers, or breathing tube. Eye spots usually present, but compound eyes absent.
Family: Legs 5-segmented plus 2 tarsal claws. Abdominal segments 1–9 with lateral gills. Abdominal segment 10 (posterior-most segment) with 4 stout hooks.
Genus: Head with a distinct collar posteriorly, 4 claws at posterior end, lateral filaments along abdomen