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ResumenEn el presente trabajo se analizó la riqueza específica, abundancia y actividad de la comunidad de arañas Mygalomorphae en la Reserva Natural Sierra del Tigre, Buenos Aires, Argentina. Este ecosistema serrano alberga numerosas especies endémicas y es rico en fauna y flora nativa. La abundancia de arañas se muestreó mensualmente desde mayo de 2011 a mayo de 2012, mediante recolección manual y trampas de caída. Las especies registradas en el área de estudio fueron Actinopus sp. 1 (Actinopodidae), Grammostola vachoni Schiapelli y Gerschman, 1960; Plesiopelma longisternale Schiapelli y Gerschman, 1942 y Catumiri argentinense (Mello-Leitão, 1941) (Theraphosidae). Grammostola vachoni resultó la especie dominante en la recolección manual y Actinopus sp. 1 en trampas de caída. Se discuten y analizan la variación estacional, diversidad y abundancia de la comunidad de migalomorfas. Las Mygalomorphae del sistema de Tandilia comprenden un grupo importante de arañas sedentarias y criptozoicas que parecen depender del tipo de ambiente y factores ambientales.AbstractWe documented the specific richness, abundance and activity of the Mygalomorph spider community in the Natural Reserve Sierra del Tigre, Buenos Aires, Argentina. This hilly ecosystem is home for many endemic species and rich in native fauna and flora. Spider abundance was sampled monthly from May 2011 - May 2012 by hand capture and pitfall traps. The species recorded in the study area were Actinopus sp. 1 (Actinopodidae), Grammostola vachoni Schiapelli y Gerschman, 1960; Plesiopelma longisternale Schiapelli y Gerschman, 1942 and Catumiri argentinense (Mello-Leitão, 1941) (Theraphosidae). Grammostola vachoni was the dominant species in hand capture and Actinopus sp. 1 in pitfall traps. The seasonal variation, diversity, and abundance of the mygalomorph community are analyzed and discussed here. The Mygalomorphae of the Tandilia system comprises an important group of sedentary and cryptozoic spiders that seem to be dependent on habitat type and environmental factors

La comunidad de arañas Mygalomorphae (Araneae) de la Reserva Natural Sierra del Tigre, Tandilia, Buenos Aires, Argentina