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


Species Picromerus bidens

Picromerus bidens spike-shouldered stink bug - Picromerus bidens Stink Bug - Picromerus bidens Predatory Stink Bug nymph - Picromerus bidens Euschistus - Picromerus bidens Picromerus bidens? - Picromerus bidens - male - female Predatory Stink bug with prey - possibly Picromerus bidens? - Picromerus bidens Stink (?) bug - brown on stem - Picromerus bidens
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Heteroptera (True Bugs)
Infraorder Pentatomomorpha
Superfamily Pentatomoidea
Family Pentatomidae (Stink Bugs)
Subfamily Asopinae (Predatory Stink Bugs)
Genus Picromerus
Species bidens (Picromerus bidens)
Other Common Names
Spiked Shieldbug (UK)
Explanation of Names
Picromerus bidens (Linnaeus 1758)
11-14 mm(1)
large laterally-projecting humeral spine; tibiae typically tricolored: brown at the knee, pale in the middle, and reddish apically
native to the Palaearctic (across n Eurasia), adventive in our area: ne NA (NS-PA to ON-MI)(2)
caterpillars, esp. webworms and tent caterpillars(3)
Life Cycle
gregarious during first two instars and phytophagous, but gradually disperses in later instars and becomes predacious(1)
earliest NA record: ME 1932(1)
potentially useful predator of certain leaf-feeding insects (e.g., pine sawfly larvae)(4)
Internet References