75 (1): 3 – 44 24.4.2017 © Senckenberg Gesellschaft für Naturforschung, 2017. Systematic revision and phylogeny of the South Ameri- can sun-spider genus Gaucha Mello-Leitão (Solifugae: Mummuciidae), with description of four new species and two new generic synonymies Ricardo Botero-Trujillo *, 1, Ricardo Ott 2 & Leonardo S. Carvalho 3, 4 1 División Aracnología, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” – CONICET, Avenida Ángel Gallardo 470, CP: 1405DJR, C.A.B.A., Buenos Aires, Argentina; Ricardo Botero-Trujillo * [
[email protected];
[email protected]] — 2 Museu de Ciências Naturais, Fundação Zoobotânica do Rio Grande do Sul, Rua Dr. Salvador França, 1427, 90690-000 Porto Alegre, RS, Brazil — 3 Universidade Federal do Pi- auí, Campus Amílcar Ferreira Sobral, BR 343, KM 3.5, Bairro Meladão, s/no. CEP 64800-000, Floriano, PI, Brazil — 4 Programa de Pós-Graduação em Zoologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil — * Corresponding author Accepted 29.x.2016. Published online at www.senckenberg.de/arthropod-systematics on 5.iv.2017. Editor in charge: Lorenzo Prendini Abstract The South American sun-spider genus Gaucha Mello-Leitão, 1924 is herein studied from a combined approach of cladistics and traditional taxonomy. This is the first cladistic analysis for a group of mummuciid solifuges, and it is pioneer in integrating traditional morphological characters with landmark data for inferring the phylogeny of any group of Solifugae. As a result, Gaucha is redefined and its monophyly demonstrated. Gaucha fasciata Mello-Leitão, 1924, type species of this formerly monotypic genus, is redescribed based on specimens from the type locality, in Rio Grande do Sul, Brazil.