Northwest Insects and Spiders

This page is devoted to the more common insects and spiders of the Northwest. A complete list and description of these arthropods is just about impossible for any single source; for further detailed information I recommend the Burke Museum. The information below is taken from the textbook classic, “Invertebrate Zoology” by Rupert and Barnes, 6th edition.

Subphylum Chelicerata:

Class Merostomata – aquatic chelicerates

Class Pycnogonida – sea spiders

Class Arachnida – scorpions, spiders, mites, ticks, harvestman

  • Order Scorpiones – the scorpions; oldest known terrestrial arthropods
  • Orders Palpigradi, Schizomida, Uropygi, Uraneae, Amblypygi, Ricinulei – small tropical and semi-tropical orders of arachnids
  • Order Araneae – spiders; the largest order of arachnids
  • Order Pseudiones – tiny arachnids that generally live under leaf mold, bark, logs, etc. and resemble little scorpions due to their large pedipalps
  • Order Solifugae – camel spiders or wind spiders
  • Order Opiliones – harvestman or “Daddy Longlegs”
  • The Acari – a huge group of seven orders that contains the mites and ticks

 Subphylum Hexapoda:

Class Insecta:

  • Order Diplura – small, blind and wingless found under logs, rocks, etc. Note the pair of caudal filaments at end of abdomen
  • Order Protura – small, eyeless; lack antenna
  • Order Collembola – springtails
  • Order Microcoryphia or Archeognatha – jumping bristletails
  • Order Ephemeroptera – mayflies
  • Order Odonata – dragonflies and damselflies
  • Oder Orthoptera – grasshoppers, katydids, crickets, roaches, mantids, and walkingsticks
  • Order Isoptera – termites
  • Order Plecoptera – stone flies
  • Order Dermaptera – earwigs
  • Order Embioptera – web spinners
  • Order Pscoptera – book lice, bark lice, and poscids
  • Order Zoroptera – pale, soft bodied little guys that resemble termites
  • Order Mallophaga – chewing lice and bird lice
  • Order Anoplura – sucking lice
  • Order Thysanoptera – thrips
  • Order Hemiptera – true bugs
  • Ordr Homoptera – cicadas, leaf hoppers, aphids
  • Order Neuroptera – Lacewings, ant lions, mantispids, snake flies, dobsonflies
  • Order Coleoptera – Beetles and weevils (the largest order of insects; more than 300,00 species)
  • Order Strepsiptera – tiny beetle like insects, usually parasitic on other insects
  • Order Mecoptera – scorpion flies
  • Order Trichoptera – caddis flies and water moths
  • Order Lepidoptera – butterflies and moths
  • Order Diptera – true flies
  • Oder Hymenoptera – ants, bees, wasps, and sawflies
  • Order Siphonaptera – fleas
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