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Taxonomic revision of neotropical Ariadna Audouin, 1826 (Araneae, Segestriidae)

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André Marsola Giroti
Total Authors: 1
Document type: Master's Dissertation
Press: São Paulo.
Institution: Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB)
Defense date:
Examining board members:
Antonio Domingos Brescovit; Alexandre Bragio Bonaldo; Ricardo Ott
Advisor: Antonio Domingos Brescovit

The genus Ariadna Audouin, 1826 currently comprises 99 of the 119 described species of Segestriidae. Its distribution comprises all continents (except Antarctica), but is found most on the tropical and subtropical regions. In this study, a taxonomic revision of Ariadna in the Neotropical region is presented, together with detailed descriptions of the body morphology, and male and female genitalia. After the examination of nearly 2200 type and non-type specimens from 24 national and international collections, we detected 30 species taxonomically valid for the Neotropical region, 22 previously described and eight new: Ariadna sp. n. 1, Ariadna sp. n. 3, Ariadna sp. n. 4, Ariadna sp. n. 6, Ariadna sp. n. 7 e Ariadna sp. n. 8 from Brazil; Ariadna sp. n. 2 from Central America e Ariadna sp. n. 5 from Chile. The following taxa are newly synonymized: A. pragmatic with A. bicolor, A. gracilis and A. conspersa with A. obscura, A. murphyi with A. tarsalis, A. pusilla with A. maxima, A. dubia with A. boliviana, e A. spinifera with A. mollis. Two species were proposed as nomina dubia: A. solitaria and A. tubicola. The allotype of A. crassipalpa described by Camargo (1950) and the paratype of A. levii described by Grismado (2008) were identified as A. mollis and A. maxima, respectively. The male of A. cephalotes and the female of A. calilegua are described for the first time. Twenty five species were placed in six groups: bicolor group, arthuri group, mollis group, boliviana group, araucana group and sp. n. 6 group, based in putative synapomorphies between the species. Five species were not placed in any of the groups due to the incompatibility between the morphological characters presented by them and the grouped species: A. maxima, A. cephalotes, A. tovarensis, A. fidicina and A. abrilae. The grouping hypothesis presented in this study, reinforced the position of some of the species grouped by Beatty (1970) (AU)