Arachnida

From Ancient Greek ἀράχνη (arákhnē).

Arachnida

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

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.

• (class): Eukaryota – superkingdom; Animalia – kingdom; Bilateria – subkingdom; Protostomia – infrakingdom; Ecdysozoa – superphylum; Arthropoda – phylum; Chelicerata - subphylum

• (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)

• ⇒ English: arachnoid
• → French: arachnide
  • → English: arachnid

• 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: 10.1371/journal.pone.0119248