mesosoma
arachnid anatomy
Quick Summary
The mesosoma is the middle region of the body in certain invertebrates, particularly when it cannot be easily broken down into its original segments. In arachnids, it specifically refers to the preabdomen, which is part of the abdomen. This region, along with the metasoma (postabdomen), forms the segmented abdomen of some arachnids like scorpions. The mesosoma is distinct from the cephalothorax, which is the fused head and thorax region.123
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