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Acanthogonatus confusus : ウィキペディア英語版 | Acanthogonatus confusus
''Acanthogonatus confusus'' is a mygalomorph spider of Argentina and Chile, its name referring to the confusion between this species and ''A. subcalpeianus''.〔Goloboff, Pablo A. "A revision of the South American spiders of the family Nemesiidae (Araneae, Mygalomorphae). Part 1, Species from Peru, Chile, Argentina, and Uruguay. Bulletin of the AMNH; no. 224." (1995).〕 Males are recognized by their long palpi, together with the absence of a tibial apophysis; females are recognized by the spermathecae (similar to ''A. fuegianus'', ''A. centralis'' and ''A. parana'', which have - unlike ''A. Confusus'' - no inferior tarsal claws on tarsus IV). ==Description==
*Female: total length ; cephalothorax length , width ; cephalic region length , width ; fovea width ; labium length , width ; sternum length , width . Its cephalic region is low and flat; its fovea is sinuous, procurved and without a posterior notch. Its labium possesses 3 cuspules. A serrula is present and well developed, occupying an extended area on the anterior lobe. Its posterior sternal sigilla is two times longer than wide and its sternum is rebordered. Chelicerae: rastellum absent; book lung openings appear wider than other species of the genus, with their posterior rim more sclerotized. Their colour resembles the males.〔 *Male: total length ; cephalothorax length , width ; cephalic region length , width ; labium length , width ; sternum length , width . Its labium has 1 cuspule. A serrula is present and well developed. Its sternal sigilla is shallow and small, while its sternum is rebordered. Chelicerae: rastellum absent. Cheliceral tumescence is present: small, acetose and ventrally protruding. Its metatarsus are gently curved (almost straight). Cephalothorax, legs and palpi are reddish brown; abdomen yellowish in colour with brown chevron.〔
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