Pseudoscorpiones: Morphology & Physiology

Pseudoscorpions have elongate pedipalps that are modified into a grasping appendage, the chela, as in scorpions. The chelal fingers may contain venom glands that are used to subdue prey. The chelicerae are two-segmented, and discharge silk from the prosomal silk glands via a galea on the tip of the movable finger.

The prosoma and opisthosoma are broadly joined to each other, but the opisthosoma lacks the tail and terminal sting that characterises scorpions. The prosoma is covered by a sclerotized plate, the carapace, which bears a maximum of two pairs of lateral eyes. The abdomen is covered by dorsal and ventral platelets, and joined laterally by the pleural membrane, which allows expansion after feeding or during embryogenesis.

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