Arachnida

Translingual right|thumb|Acarus siro species thumb|Trogulus nepaeformis species(order Opiliones order) right|thumb|Scorpio maurus palmatus subspecies Etymology From mul grc ἀράχνη. Proper noun class 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 subclass is sometimes used, but doing so leads to an incompletely specified level. Hypernyms class ; Chelicerata subphylum subphylum Hyponyms class Acari subclass subclass no consensus on use Holothyrida order, Ixodida order, Mesostigmata order, Opilioacarida order, Sarcoptiformes order, Trombidiformes order orders within Acari subclass when used Amblypygi order, Araneae order, Opiliones order, Palpigradi order, Pseudoscorpionida order, Ricinulei order, Schizomida order, Scorpiones order, Solifugae order, Thelyphonida order, Uropygi order (= Thelyphonida) orders †Haptopoda order, †Phalangiotarbida order, †Trigonotarbida order, †Uraraneida order extinct orders Descendants en arachnoid 1 fr arachnide 1 References 1 mul Arachnids