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Harvestman anatomy
Harvestmen are an order of arachnids, with which they share many characteristics: their body is divided into two body regions (tagmata), the abdomen (opisthosoma) and the cephalothorax (prosoma); however, unlike in spiders, the juncture is often poorly defined. They have chelicerae, pedipalps and four pairs of legs. Most harvestmen have two eyes, although there are eyeless species.〔
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==Prosoma==
The frontal portion of the body contains the main part of the centralized nervous system, the feeding organs and defensive glands, and the legs. The upper side is covered by a sclerotized carapace, which is formed by the fused tergites of the six appendage-bearing somites. The feeding apparatus is called the ''stomotheca''. It is formed by extensions from the pedipalps and the first leg pair. The ''ocularium'', an elevated mound placed in the middle of the carapace, usually contains two simple eyes, although they are lacking in some species. It can be smooth or armed with small or large spines. In some Dyspnoi the eyes are located on projections that form a hood covering the mouthparts.
On the sides of the prosoma there are defensive glands called ''ozopores'', which in Cyphophthalmi open on the tip of an elevated cone, the ''ozophore''. The prosomal muscles attach to the endosternite, a horizontal sheet of connective tissue similar to cartilage that acts as an internal skeleton. In some harvestmen (''Phalangium'', ''Odiellus'' and ''Leiobunum'') it contains calcium deposits. The endosternite is U-shaped, with the arms facing forward and embracing the ganglion above the esophagus.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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