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Acanthogonatus birabeni : ウィキペディア英語版 | Acanthogonatus birabeni
''Acanthogonatus birabeni'' is a mygalomorph spider of Argentina, named after Max Birabén, an Argentinian arachnologist.〔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).〕 It differs from others in the ''patagonicus'' group by its smaller size and (except for ''A. fuegianus'') by the less developed bulb keels. ==Description==
*Male: total length ; cephalothorax length , width ; cephalic region length , width ; medial ocular quadrangle length , width ; labium length , width ;sternum length , width . Its labium possesses no cuspules. A serrula is apparently present as a small patch of denticles. Its posterior sternal sigilla is small, shallow and marginal; its sternum weakly rebordered. Chelicerae: rastellum is formed by long, thin, stiff setae. Cheliceral tumescence is present. Leg I: tibia long and cylindrical, with an apical prolateral spur typical for this genus; metatarsus evenly curved downward in its basal third, the remainder being straight. The entire spider is a light yellow colour, with a dorsal abdominal pattern similar to that in ''A. patagonicus''.〔
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