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

Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

National Moth Week was July 23-31, 2022! See moth submissions.

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

Photos of insects and people from the 2018 gathering in Virginia, July 27-29

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

Previous events


Species Porcellio dilatatus - Giant Canyon Woodlouse

Porcellio dilatatus Porcellio dilatatus Oniscus asellus or Porcellio dilatatus or ? - Porcellio dilatatus Rough Sowbug? - Porcellio dilatatus Porcellio dilatatus (misidentified as Trachelipus) - Porcellio dilatatus Porcellio dilatatus Pillbug? - Porcellio dilatatus Large Isopod from Los Angeles - Porcellio dilatatus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Crustacea (Crustaceans)
Class Malacostraca (Malacostracans)
Superorder Peracarida (Marsupial Crustaceans)
Order Isopoda (Isopods)
No Taxon (Scutocoxifera)
Suborder Oniscidea (Woodlice)
Infraorder Holoverticata
No Taxon (Orthogonopoda)
No Taxon (Crinocheta)
Family Porcellionidae
Genus Porcellio
Species dilatatus (Giant Canyon Woodlouse)
Explanation of Names
Porcellio dilatatus Brandt 1833
up to 15 mm(1)
wide oval shape (wider and bigger than average P. scaber specimen)
brownish color with typical lighter pattern
well developed middle lobe on the head, but rounded rather than pointy
telson elongated with rounded tip (not pointy-triangular as, e.g., in P. scaber)
[adapted from comments at (2)]
native to W Europe, adventive and widespread in NA(3); Cosmopolitan
Internet References