list of arachnids
The arachnids (class Arachnida) are an arthropod group that includes spiders, daddy longlegs, scorpions, mites, and ticks as well as lesser-known subgroups. This is a list of notable arachnids grouped by order (or superorder) and arranged alphabetically.
superorder Acariformes
order Amblypygi
order Araneae (spiders)
- infraorder Araneomorphae
- brown recluse (Loxosceles reclusa)
- comb-footed spiders (family Theridiidae)
- black widows (genus Latrodectus)
- redback (Latrodectus hasselti)
- crab spiders (family Thomisidae)
- funnel weavers (family Agelenidae)
- giant huntsman spider (Heteropoda maxima)
- jumping spiders (family Salticidae)
- jumping ant spider (Myrmarachne formicaria)
- peacock spiders (genus Maratus)
- lynx spiders (family Oxyopidae)
- nursery-web spiders (family Pisauridae)
- ogre-faced spiders (family Deinopidae)
- orb weavers (family Araneidae)
- bolas spiders (genus Mastophora)
- garden spider (Araneus diadematus)
- silk spiders (genera Nephila and Trichonephila; sometimes placed in the family Nephilidae)
- joro spider (T. clavata)
- pelican spiders (family Archaeidae)
- pirate spiders (family Mimetidae)
- ray spiders (family Theridiosomatidae)
- sac spiders (family Clubionidae)
- sheet-web weavers (family Linyphiidae)
- spitting spiders (family Scytodidae)
- wandering spiders (family Ctenidae)
- water spider (Argyroneta aquatica)
- wolf spiders (family Lycosidae)
- infraorder Mygalomorphae
- Australian funnel-web spiders (family Atracidae)
- curtain-web spiders (family Dipluridae)
- folding-door spiders (family Antrodiaetidae)
- turret spider (Atypoides riversi)
- purseweb spiders (family Atypidae)
- tarantulas (family Theraphosidae)
- desert tarantula (Aphonopelma chalcodes)
- goliath birdeater (Theraphosa blondi)
- trapdoor spiders (family Ctenizidae and others)
- California trapdoor spider (Bothriocyrtum californicum)
- ravine trapdoor spider (Cyclocosmia truncata)
- suborder Mesothelae
- segmented spiders (family Liphistiidae)
order Opiliones
order Palpigradi
- microscorpions
superorder Parasitiformes
- order Ixodida
- ticks
- lone star tick (Amblyomma americanum)
- order Mesostigmata
- varroa mite (Varroa destructor)
order Pseudoscorpiones
order Ricinulei
- ricinuleids
order Schizomida
- schizomids
order Scorpiones
order Solifugae
order Uropygi
The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Melissa Petruzzello.
Citation Information
Article Title:
list of arachnids
Website Name:
Encyclopaedia Britannica
Publisher:
Encyclopaedia Britannica, Inc.
Date Published:
12 November 2025
Access Date:
November 14, 2026