Arachnida

Translingual

Acarus siro

Trogulus nepaeformis
(order Opiliones)

Scorpio maurus palmatus

Etymology

From Ancient Greek ἀράχνη (arákhnē).

Proper noun

Arachnida

A taxonomic class within the subphylum Chelicerata – the spiders, scorpions, harvestmen, mites and ticks, having four pairs of thoracic appendages.

Usage notes

Consensus is lacking for taxonomic classification between the class and order levels. The subclass Acari is sometimes used, but doing so leads to an incompletely specified level.

Hyponyms

(class): Acari (subclass, no consensus on use)
- Holothyrida, Ixodida, Mesostigmata, Opilioacarida, Sarcoptiformes, Trombidiformes (orders, within Acari when used)
- Amblypygi, Araneae, Opiliones, Palpigradi, Pseudoscorpionida, Ricinulei, Schizomida, Scorpiones, Solifugae, Thelyphonida, Uropygi (= Thelyphonida) (orders)
- †Haptopoda, †Phalangiotarbida, †Trigonotarbida, †Uraraneida (extinct orders)

References

Arachnida on Wikipedia.Wikipedia
Arachnida on Wikispecies.Wikispecies
Arachnida on Wikimedia Commons.Wikimedia Commons
Arachnida at the Tree of Life Web Project
Ruggiero MA, Gordon DP, Orrell TM, Bailly N, Bourgoin T, Brusca RC, et al. (2015) A Higher Level Classification of All Living Organisms. PLoS ONE 10(4): e0119248. doi: 10.1371/journal.pone.0119248. pmid:25923521

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