A taxonomic revision of the spider genus Ariadna Audouin, 1826 in Argentina and Chile, with the description of five new species (Arachnida, Araneae, Segestriidae)

The spider genus Ariadna Audouin, 1826 is represented in the Argentinean and Chilean faunas by nine species at least. Four of them were previously known: A. maxima (Nicolet, 1849), widely distributed in Chile and recorded for the first time in Argentina; A. cephalotes Simon, 1907, from Peru and Bolivia, newly recorded in northwestern Argentina; A. mollis (Holmberg, 1876) and A. boesenbergi Keyserling, 1877 from Argentina, also found in Uruguay and Brazil. Five new species are here described: A. calilegua n. sp. from northwestern Argentina, and four species from different regions of Chile are also described: A. changellkuk n. sp.; A. abrilae n. sp.; A. levii n. sp. and A. araucana n. sp. The type specimens of the Chilean species described by Nicolet (1849, under Dysdera) were examined, confirming all the synonymies established by Simon in 1896 (D. virens, D. incerta, D. coarctata and D. longipes with A. maxima). The internal genital structures show diagnostic characters for the identification of females. Ariadna mollis and A. boesenbergi are sympatric only in the region of Buenos Aires city and Uruguay, but not in other parts of their geographic ranges.