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Stenoterommata tenuistylum
''Stenoterommata tenuistylum'' is a mygalomorph spider of Argentina, named after the thin, slender embolus in males of this species, which distinguish it from males of the sympatric ''S. crassistylum''.〔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).〕 Females are distinguished from other three-clawed Stenoterommata by their spermathecae, which have a short basal portion and a single receptaculum arising from near the tip of the base. Males are diagnosed by one of the species autapomorphies: the presence of numerous short spines on the ventral metatarsus I.
==Description==
*Male: total length ; cephalothorax length , width ; cephalic region length , width ; labium length , width ; sternum length , width . Its labium has no cuspules and serrula are not visible. Its sternal sigilla are small, oval and shallow with its sternum slightly rebordered. Chelicerae: rastellum absent (only weak, attenuate setae). Cheliceral tumescence is present and flat, with the lower half covered with setae. Cephalothorax, legs and palpi are a yellowish-reddish brown colour; abdomen yellow, with brown chevron.〔
*Female: total length ; cephalothorax length , width ; cephalic region length , width ; fovea width ; labium length , width ; sternum length , width . Its cephalic region is convex, with fovea procurved. Its labium possesses 4 cuspules and no serrula is visible. Its sternal sigilla is small and shallow. Chelicerae: rastellum formed by attenuate setae. Colour as in the male.〔
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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