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  2. Chelicerata - Wikipedia

    en.wikipedia.org/wiki/Chelicerata

    Chelicerata split from Mandibulata by the mid-Cambrian, as evidenced by stem-group chelicerates like Habeliida and Mollisonia present by this time. [2] The surviving marine species include the four species of xiphosurans (horseshoe crabs), and possibly the 1,300 species of pycnogonids (sea spiders), if the latter are indeed chelicerates. On the ...

  3. Chelicerae - Wikipedia

    en.wikipedia.org/wiki/Chelicerae

    The chelicerae (/ k ə ˈ l ɪ s ər iː /) are the mouthparts of the subphylum Chelicerata, an arthropod group that includes arachnids, horseshoe crabs, and sea spiders. Commonly referred to as "jaws", chelicerae may be shaped as either articulated fangs, or as a type of pincers.

  4. Merostomata - Wikipedia

    en.wikipedia.org/wiki/Merostomata

    However, a 2022 analysis recovered the monophyly of Merostomata, as opposed to a monophyletic Arachnida, with Xiphosura as the only modern representative in a derived position, indicating the convergence of several characteristics that supposedly united the arachnids.

  5. Arthropod mouthparts - Wikipedia

    en.wikipedia.org/wiki/Arthropod_mouthparts

    Paired maxillae cut food and manipulate it during mastication. Maxillae can have hairs and "teeth" along their inner margins. At the outer margin, the galea is a cupped or scoop-like structure, which sits over the outer edge of the labium. They also have palps, which are used to sense the characteristics of potential foods.

  6. Ecdysozoa - Wikipedia

    en.wikipedia.org/wiki/Ecdysozoa

    Ecdysozoa (/ ˌ ɛ k d ɪ s oʊ ˈ z oʊ ə /) is a group of protostome animals, [8] including Arthropoda (insects, chelicerata (including arachnids), crustaceans, and myriapods), Nematoda, and several smaller phyla.

  7. Mandibulata - Wikipedia

    en.wikipedia.org/wiki/Mandibulata

    The subphylum Mandibulata constitutes one of the major subdivisions of the phylum Arthropoda, alongside Chelicerata. Mandibulates include the crustaceans, myriapods (centipedes and millipedes), and all true insects.

  8. Sanctacaris - Wikipedia

    en.wikipedia.org/wiki/Sanctacaris

    Sanctacaris is a Middle Cambrian arthropod from the Burgess Shale of British Columbia.It was most famously regarded as a stem-group chelicerate, a group which includes horseshoe crabs, spiders and scorpions, although subsequent phylogenetic studies have not always supported this conclusion. [1]

  9. Dekatriata - Wikipedia

    en.wikipedia.org/wiki/Dekatriata

    Dekatriata is a clade of planatergan chelicerates including the groups Arachnida, Chasmataspidida, Eurypterida [1] and additionally two stem-genera Winneshiekia and Houia. [2] ...