Arachnida
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Acarus siro 
Trogulus nepaeformis
(order Opiliones) 
Scorpio maurus palmatus
Translingual
(order Opiliones)
Etymology
From Ancient Greek ἀράχνη (arákhnē).
Proper noun
Arachnida
- A taxonomic class within the phylum Arthropoda – 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.
Hypernyms
- (class): Eukaryota – superkingdom; Animalia – kingdom; Bilateria – subkingdom; Protostomia – infrakingdom; Ecdysozoa – superphylum; Arthropoda – phylum; Chelicerata - subphylum
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)
Descendants
References
Arachnida on Wikipedia.Wikipedia 
Arachnida on Wikispecies.Wikispecies 
Category: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. PMID 25923521, →DOI
