77 (2): 239 – 250 2019 © Senckenberg Gesellschaft für Naturforschung, 2019. Revised phylogenetic relationships within the Drosophila buzzatii species cluster (Diptera: Drosophilidae: Droso- phila repleta group) using genomic data Juan Hurtado *, 1, 2, #, Francisca Almeida*, 1, 2, #, Santiago Revale 3 & Esteban Hasson *, 1, 2 1 Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Au- tónoma de Buenos Aires, Argentina; Juan Hurtado [
[email protected]]; Francisca Almeida [
[email protected]]; Esteban Hasson [ehasson @ege.fcen.uba.ar] — 2 Instituto de Ecología, Genética y Evolución de Buenos Aires, Consejo Nacional de Investigaciones Científi- cas y Técnicas, Ciudad Autónoma de Buenos Aires, Argentina — 3 Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK — * Corresponding authors; # Contributed equally to this work Accepted on March 15, 2019. Published online at www.senckenberg.de/arthropod-systematics on September 17, 2019. Published in print on September 27, 2019. Editors in charge: Brian Wiegmann & Klaus-Dieter Klass. Abstract. The Drosophila buzzatii cluster is a South American clade that encompasses seven closely related cactophilic species and constitutes a valuable model system for evolutionary research. Though the monophyly of the cluster is strongly supported by molecular, cytological and morphological evidence, phylogenetic relationships within it are still controversial. The phylogeny of the D. buzzatii clus- ter has been addressed using limited sets of molecular markers, namely a few nuclear and mitochondrial genes, and the sharing of fxed chromosomal inversions. However, analyses based on these data revealed inconsistencies across markers and resulted in poorly resolved basal branches. Here, we revise the phylogeny of the D.