from Wiktionary, Creative Commons Attribution/Share-Alike License

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


from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ἀράχνη.


  • In the artillery department, its 'Arachnida' electronic targeting and combat management is already in service on the UK's light artillery guns and was exported in quantity to a Middle East customer, and Denel's world-class artillery ammunition is currently being evaluated in the NATO environment as well as in the United States.

    Defense Industry Daily

  • The Arctic has about 300 species of spiders (Arachnida), 700 species of mites (Acarina), 400 species of springtails (Collembola), 500 species of nematodes, 70 species of oligochaetes (of which most are Enchytraeidae), only a few mollusks, and an unknown number of protozoan species.

    Implications of current species distributions for future biotic change in the Arctic

  • This text, for example, lists Tardigrada (water bears) as a class within the subphylum of Arachnida in the phylum Arthropoda - as opposed to the current classification of Tardigrades in their own phylum.

    New art

  • Like spiders, they are members of the class Arachnida, but they are actually solpugids.

    The Facts About Camel Spiders | Impact Lab

  • Arachnida, are represented in the Coal, either by existing genera, or by forms differing from existing genera in quite minor peculiarities.


  • The Carboniferous Insecta and Arachnida are neither less specialized, nor more embryonic, than these that now live, nor are the Liassic Cirripedia and Macrura; while several of the Brachyura, which appear in the Chalk, belong to existing genera; and none exhibit either an intermediate, or an embryonic, character.


  • The first troglobite scorpion from Israel and a new chactoid family Arachnida: Scorpiones.

    Archive 2007-08-01

  • Tree of Life has a list of references on the evolution and phylogeny of Arachnida, the class to which the pseudoscorpions belong.

    The return of the pseudoscorpions

  • The site includes spiders (phylum Arthropoda, class Arachnida), isopods (e.g., pill bugs; phylum Arthropoda, class Crustacea), and insects (phylum Arthropoda, class Insecta); bugs are actually a specific order of insect (hemipterans - true bugs), so even most insects can't technically be called bugs.

    Parenting is hard.

  • At first he failed to recognise the photograph, but when it was explained by the pointed allusion to a living Maltese-cross spider close at hand, a gleam of intelligence brightened his bewildered face, and he delivered a self-satisfied dissertation on the order Arachnida that is worth quoting:

    Tropic Days


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