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

See Moth submissions from National Moth Week 2023

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

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


Family Armadillidiidae - European Pillbugs

Pillbug - Armadillidium vulgare Woodlouse IMG_4871 - Armadillidium vulgare What is this creepy crawly thing? It's small. - Armadillidium vulgare Woodlice - Armadillidium vulgare Pillbug - Armadillidium vulgare ??? - Armadillidium vulgare woodlouse - Armadillidium vulgare isopod - Armadillidium vulgare
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 Armadillidiidae (European Pillbugs)
Explanation of Names
Armadillidiidae Brandt 1833
2 species in a single genus in our area (both introduced), hundreds of spp. in ~20 genera total
uropods shorter than the last abdominal segment(1)
American species of Armadillidae (note the number of d’s) have hourglass-shaped telson, while Armadillidium has triangular- or trapezoidal-shaped telsons
Most other families can not roll into a ball and have tails longer than the last abdominal segment.
Porcellio scaber next to Armadillidium nasatum Note the length of the uropods
Native to W Palaeactic, 3 spp. introduced worldwide
Works Cited
1.Spiders and Their Kin: A Golden Guide from St. Martin's Press
Herbert W. Levi, Lorna R. Levi, Nicholas Strekalovsky. 2001. St. Martin's Press.