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  2. Spider anatomy - Wikipedia

    en.wikipedia.org/wiki/Spider_anatomy

    The underside and head of a female spider. Spiders, unlike insects, have only two main body parts ( tagmata) instead of three: a fused head and thorax (called a cephalothorax or prosoma) and an abdomen (also called an opisthosoma ). The exception to this rule are the assassin spiders in the family Archaeidae, whose cephalothorax is divided into ...

  3. Chelicerae - Wikipedia

    en.wikipedia.org/wiki/Chelicerae

    The basal parts of the chelicerae are the two iridescent green mouthparts. The chelicerae ( / kəˈlɪsəriː /) 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. Pedipalp - Wikipedia

    en.wikipedia.org/wiki/Pedipalp

    Pedipalp. Green-shaded pedipalps in an illustrated dorsal view of a whip scorpion. Pedipalps (commonly shortened to palps or palpi) are the secondary pair of forward appendages among chelicerates – a group of arthropods including spiders, scorpions, horseshoe crabs, and sea spiders. The pedipalps are lateral to the chelicerae ("jaws") and ...

  5. Book lung - Wikipedia

    en.wikipedia.org/wiki/Book_lung

    Spider book lungs (cross section) Internal anatomy of a female spider, book lungs shown in pink. A book lung is a type of respiration organ used for atmospheric gas exchange that is present in many arachnids, such as scorpions and spiders. Each of these organs is located inside an open ventral abdominal, air-filled cavity (atrium) and connects ...

  6. Spinneret - Wikipedia

    en.wikipedia.org/wiki/Spinneret

    A spinneret is a silk -spinning organ of a spider or the larva of an insect. Some adult insects also have spinnerets, such as those borne on the forelegs of Embioptera. [ 1] Spinnerets are usually on the underside of a spider's opisthosoma, and are typically segmented. [ 2][ 3] While most spiders have six spinnerets, some have two, four, or ...

  7. Spider - Wikipedia

    en.wikipedia.org/wiki/Spider

    Spiders ( order Araneae) are air-breathing arthropods that have eight limbs, chelicerae with fangs generally able to inject venom, [ 2] and spinnerets that extrude silk. [ 3] They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms. [ 4][ 5] Spiders are found worldwide on every continent ...

  8. Epigyne - Wikipedia

    en.wikipedia.org/wiki/Epigyne

    Epigyne. The external anatomy of a spider, with the epigyne labeled. The internal anatomy of a spider, with the reproductive system (purple) reaching the exoskeleton at the epigyne. The epigyne or epigynum is the external genital structure of female spiders. As the epigyne varies greatly in form in different species, even in closely related ...

  9. Opiliones anatomy - Wikipedia

    en.wikipedia.org/wiki/Opiliones_anatomy

    Opiliones anatomy. Opiliones (commonly known as harvestmen) are an order of arachnids and share many common characteristics with other arachnids. However, several differences separate harvestmen from other arachnid orders such as spiders. The bodies of opiliones are divided into two tagmata (arthropod body regions): the abdomen ( opisthosoma ...

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