Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

Discussion, insects and people from the 2018 BugGuide Gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington


Species Petrophila canadensis - Canadian Petrophila - Hodges#4779

Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Pyraloidea (Pyralid and Crambid Snout Moths)
Family Crambidae (Crambid Snout Moths)
Subfamily Acentropinae
Tribe Argyractini
Genus Petrophila
Species canadensis (Canadian Petrophila - Hodges#4779)
Hodges Number
Synonyms and other taxonomic changes
original combination Parargyractis canadensis Munroe, 1972
* phylogenetic sequence # 144100
wingspan 11-18 mm
Adult: forewing central area lacks triangular arrangement of 3 black spots, present in P. fulicalis; hindwing with two transverse brownish bands (proximal band broad, and distal one thin) separated by white space; trianglular patch of fine black speckling extends at least halfway down from costa of hindwing (may be hidden by overlapping forewing)
southern Canada and northeastern United States: Alberta to Quebec, south in the east to at least Maryland
larvae live inside underwater retreats (sheets of spun silk) on top of rocks in streams and rivers; adults can be found on nearby riparian vegetation during the day
adults fly from May to September (2 broods)
larvae feed preferentially on diatoms in the genera Navicula and Cymbella that become trapped in their silk sheets, and also scrape algae from rocks in streams and rivers
Life Cycle
larvae are aquatic, developing in riffles of streams and rivers; two generations per year; overwinters as an adult
The "P. canadensis" images shown here look like P. fulicalis: they lack two brown bands on the hindwing, and have a triangular arrangement of 3 black spots on the forewing
See Also
Petrophila fulicalis (Larry Line, Maryland)
Print References
Lavery, Michael A. & Costa, Robert R. (1976) Life History of Parargyractis canadensis Munroe (Lepidoptera: Pyralidae)
Internet References
live adult images plus description, foodplants, flight season (Lynn Scott, Ontario)
pinned adult image plus flight season (John Glaser, Maryland)
pinned adult images and map of collection sites, showing presence in Alberta (All-Leps)
live larva images of Petrophila species, plus larval food and biology (Wilfred Laurier U., Ontario)
presence in Michigan; list (Ethan Bright, Aquatic Insects of Michigan, U. of Michigan)