How does placement in Phylum Arthropoda refine the *Dysdera* classification from Kingdom Animalia?
Answer
It specifies segmentation, chitin exoskeleton, and jointed appendages.
Kingdom Animalia is the broadest sorting category, confirming basic life requirements like being multicellular and consuming energy from others. Placement in Phylum Arthropoda signifies a massive refinement by imposing strict structural criteria. It demands the presence of a segmented body plan, the possession of a hard, protective external layer made of chitin, and the presence of jointed limbs, which are far more specific architectural details than those required for simple animal status. Silk production is a trait refined later at the Order level (Araneae), not by the Phylum.
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