How does the body structure of a Harvestman (Opiliones) differ from a true Pholcus spider?
Answer
Harvestmen have one fused body segment, whereas true spiders like Pholcus have two distinct body segments.
Harvestmen are distinguished by having one fused body segment, appearing as a single oval shape, in contrast to true spiders which have two distinct body segments (cephalothorax and abdomen).

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