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  2. Arachnid - Wikipedia

    en.wikipedia.org/wiki/Arachnid

    The authors favoured relationships shown by more slowly evolving genes, which demonstrated the monophyly of Chelicerata, Euchelicerata and Arachnida, as well as of some clades within the arachnids. The diagram below summarizes their conclusions, based largely on the 200 most slowly evolving genes; dashed lines represent uncertain placements.

  3. Evolution of spiders - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_spiders

    The group's origins lie within an arachnid sub-group defined by the presence of book lungs (the tetrapulmonates); [1] [2] the arachnids as a whole evolved from aquatic chelicerate ancestors. More than 45,000 extant species have been described, organised taxonomically in 3,958 genera and 114 families. [3] There may be more than 120,000 species. [3]

  4. File:Arachnid Leg Diagram.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Arachnid_Leg_Diagram.jpg

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  5. Spider anatomy - Wikipedia

    en.wikipedia.org/wiki/Spider_anatomy

    Basic characteristics of arachnids include four pairs of legs (1) and a body divided into two segments: the cephalothorax (2) and the abdomen (3). The ventral side of a brown widow spider. The epigastric plates and furrow are visible, as well as the hourglass marking on the underside of the abdomen, which is a characteristic feature of widow ...

  6. Category:Arachnid genera - Wikipedia

    en.wikipedia.org/wiki/Category:Arachnid_genera

    Printable version; In other projects Wikimedia Commons; Wikidata item; ... Pages in category "Arachnid genera" The following 30 pages are in this category, out of 30 ...

  7. Carapace - Wikipedia

    en.wikipedia.org/wiki/Carapace

    Diagram of a prawn, with the carapace highlighted in red. A carapace is a dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tortoises, the underside is called the plastron.

  8. Opiliones anatomy - Wikipedia

    en.wikipedia.org/wiki/Opiliones_anatomy

    Close-up of the chelicerae of a harvestman. The chelicerae consist of three segments, with the distal two forming a pincer [3] equipped with a row of teeth. Based on developmental gene expression data, the proximal segment is thought to be homologous to the femur and patella of the legs, the middle segment to the tibia through the tarsus of the legs, and the distal segment to the apotele (the ...

  9. Category:Arachnids - Wikipedia

    en.wikipedia.org/wiki/Category:Arachnids

    Print/export Download as PDF; Printable version; In other projects ... Pages in category "Arachnids" The following 2 pages are in this category, out of 2 total.