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Stockphotos.ro (c) 2026. All stock photos are provided by Dreamstime and are copyrighted by their respective owners.
spider |
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| Anatomically, spiders differ from other arthropods in that the usual body segments are fused into two tagmata, the cephalothorax and abdomen, and joined by a small, cylindrical pedicel. Unlike insects, spiders do not have antennae. In all except the most primitive group, the Mesothelae, spiders have the most centralized nervous systems of all arthropods, as all their ganglia are fused into one mass in the cephalothorax. Unlike most arthropods, spiders have no extensor muscles in their limbs and instead extend them by hydraulic pressure. |
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Stockphotos.ro (c) 2026. All stock photos are provided by Dreamstime and are copyrighted by their respective owners. |
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