Arachnida

Translingual

Acarus siro

Trogulus nepaeformis
(order Opiliones)

Scorpio maurus palmatus

Etymology

From Ancient Greek ἀράχνη (arákhnē).

Proper noun

Arachnida

1. 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

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

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: 10.1371/journal.pone.0119248