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of the head.

In some chelicerates (e.g. the Palpigradi), the pedipalps are unspecialized and subequal to the posterior pairs of walking legs. However, in sea spider and arachnids, the pedipalps are more or less specialized for sensory or prey-catching function - for example scorpions have pincers and male spiders have bulbous tips that act as syringes to inject sperm into the females' reproductive openings when mating.

Body cavities and circulatory systems

As

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