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Orsonwelles
''Orsonwelles'' is a genus of spiders belonging to the family Linyphiidae. The 13 known species, all native to the Hawaiian Islands, include the largest known linyphiids, reaching maximum body lengths of 14 millimeters (0.55 inches), an example of island gigantism. Each species occurs on a single island, often at high elevations. The spiders have large jaws, and are generalist predators. The genus name honors the actor and film-maker Orson Welles and many of the species names commemorate elements from Welles' films, radio productions, or roles. One species has not been collected since the 1890s, and is believed to be extinct.
==Description==
''Orsonwelles'' spiders are large, with females ranging from 8.06 to 14.07 mm in body length, and males ranging from 6.2 to 11.35 mm; the largest individuals recorded are in the species ''O. malus.'' The jaws (chelicerae) are large and massive, with many cheliceral teeth. ''Orsonwelles'' contains the largest known members of the family Linyphiidae, with the next largest, ''Laminacauda gigas'', attaining body lengths of just under 10 mm. The large size is an example of island gigantism, a phenomenon where lineages on islands evolve large body size relative to mainland relatives. The carapace and abdomen are dark brown or gray with a light band running down the middle of the carapace, and light blotches or chevron-shaped markings sometimes present on the dorsal surface of the oval-shaped abdomen. The femurs (second limb segment) of the third and fourth leg pairs possess one to six trichobothria (large sensory hairs), a trait unique among the Linyphiidae: all others lack femoral trichobothria.
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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