Arachnids
Arachnida
Arachnids are a class (Arachnida) of joint-legged invertebrate animals (arthropods), in the subphylum Chelicerata. All arachnids have eight legs, although the front pair of legs in some species has converted to a sensory function, while in other species, different appendages can grow large enough to take on the appearance of extra pairs of legs. The term is derived from the Greek word ἀράχνη (aráchnē), from the myth of the hubristic human weaver Arachne who was turned...
11 branches of this class, most-observed first
Spiders
orderAraneae
Mites and Ticks
subclassAcari
Harvestmen
orderOpiliones
Scorpions
orderScorpiones
Pseudoscorpions
orderPseudoscorpiones
Solifuges
orderSolifugae
Tailless Whipscorpions
orderAmblypygi
Whipscorpions
orderUropygi
Shorttailed Whipscorpions
orderSchizomida
Hooded Tickspiders
orderRicinulei
Micro Whipscorpions
orderPalpigradi
Where it lives
Recorded sightings
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geo-referenced records in GBIF, from museums, herbaria and field observers.
Drag the globe to turn it. Dots are where records exist, not a range map; darker means more records.
In the stacks
Searching the stacks…
Every page naming Arachnida in the Biodiversity Heritage Library →
This page is assembled live from iNaturalist, GBIF, Wikipedia, the Source Library and the Internet Archive. It is not yet part of the hand-edited codex. iNaturalist taxon 47119.