Which anatomical features characterize the Phylum Arthropoda classification of *Dysdera*?
Answer
Segmented body, chitin exoskeleton, and jointed appendages.
Placement within the Phylum Arthropoda signifies adherence to a very specific body blueprint common to insects, crustaceans, and spiders. This blueprint mandates three primary features: the body must be divided into distinct segments, it must possess a tough outer covering called an exoskeleton, which is composed of chitin, and it must feature appendages (like legs and mouthparts) that possess joints allowing for flexibility and motion. These structural elements are shared by all arthropods, differentiating them structurally from groups like Annelids (segmented worms) or Chordates (which possess an internal skeleton).

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