order
Coleoptera
“Adult Beetles”
Coleoptera
“Larval Beetles”
Diptera
“True Flies”
Ephemeroptera
“Mayflies”
Hemiptera
“True Bugs”
Lepidoptera
“Aquatic Caterpillars, Snout Moths”
Megaloptera
“Alderflies, Dobsonflies, and Fishflies”
Odonata
“Dragonflies and Damselflies”
Plecoptera
“Stoneflies”
Trichoptera
“Caddisflies”
family
Perlidae
Perlesta
“Common Stoneflies”
Genus Overview
A large predatory genus with 31 species. Ecological notes are limited. Specimens tend to be speckled.
Characteristics
POLLUTION TOLERANCE
Southeast: 0 - 4.9
Upper Midwest: 5
Midwest: 4.5
FEEDING HABITS
Collector / Gatherer
Engulfer / Predator
Engulfer / Predator
MOVEMENT
Clinger
DISTRIBUTION
Widespread (east of the Rocky Mtns.)
HABITAT
Lotic-depositional
Lotic-erosional
Lotic-erosional
Diagnostic Characters
Order
Two Tails
Two Tarsal Claws
Family
Glossae Shorter Than Paraglossae
Thoracic Gills
Genus
Occipital Ridge
+ Expanded Character List
Order:
Wings developing in wing pads. Mouthparts suitable for chewing. Gills digitiform and located near mouthparts, on neck, sides of thorax, or underside of base of abdomen, never on top or sides of abdomen. Two tarsal claws per leg. Only two tails (cerci).
Family:
Glossae much shorter than the paraglossae. Multi-branched, filamentous gills present laterally and ventrally on thorax, but not on abdomen.
Genus:
Occipital ridge absent, three ocelli, Irregularly spaced occipital spinules present along back of head, speckled appearance
Dorsal
Ventral