page_title: Opiliones anatomy
section_title: Chelicerae
hierarchical_section_title: Opiliones anatomy / Prosoma / Chelicerae
caption_attribution_description: English: This is a picture of a Harvestman Opiliones mouth at 200x magnification. I took this photo myself using an Eyeclops Bionicam. It is not a screen capture of a TV program or other copyrighted material.
context_page_description: Opiliones are an order of arachnids and share many common characteristics with other arachnids. However, several differences separate harvestmen from other arachnid orders such as spiders. The bodies of opiliones are divided into two tagmata: the abdomen and the cephalothorax. Unlike spiders, the juncture between the abdomen and cephalothorax is often poorly defined. Harvestmen have chelicerae, pedipalps and four pairs of legs. Most harvestmen have two eyes, although there are eyeless species.
context_section_description: The chelicerae consist of three segments, with the distal two forming a pincer equipped with a row of teeth. The proximal segment is probably homologous to the coxa and trochanter of the pedipalp, the middle segment to the femur through the tarsus of the legs, and the distal segment to the apotele (the claw with its modifications).
caption: Close-up of the chelicerae of a harvestman
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