title: Radiation of the Drosophila nannoptera species group in Mexico.
abstract: The Drosophila nannoptera species group, a taxon of Mexican cactophilic flies, is an excellent model system to study the influence of abiotic and biotic factors on speciation, the genetic causes of ecological specialization and the evolution of unusual reproductive characters. However, the phylogenetic relationships in the nannoptera species group and its position within the virilis-repleta phylogeny have not been thoroughly investigated. Using a multilocus data set of gene coding regions of eight nuclear and three mitochondrial genes, we found that the four described nannoptera group species diverged rapidly, with very short internodes between divergence events. Phylogenetic analysis of repleta group lineages revealed that D. inca and D. canalinea are sister to all other repleta group species, whereas the annulimana species D. aracataca and D. pseudotalamancana are sister to the nannoptera and bromeliae species groups. Our divergence time estimates suggest that the nannoptera species group radiated following important geological events in Central America. Our results indicate that a single evolutionary transition to asymmetric genitalia and to unusual sperm storage may have occurred during evolution of the nannoptera group.
authors.affiliation: CNRS UMR7592, Institut Jacques Monod, Université Paris Diderot, Paris, France.
authors.forename: M
authors.initials: M
authors.lastname: Lang
authors.affiliation: Section of Cell and Developmental Biology, Division of Biological Sciences, University of California, La Jolla, CA, USA.
authors.forename: M
authors.initials: M
authors.lastname: Polihronakis Richmond
authors.affiliation: Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, Spain.
authors.forename: A E
authors.initials: AE
authors.lastname: Acurio
authors.affiliation: Section of Cell and Developmental Biology, Division of Biological Sciences, University of California, La Jolla, CA, USA.|Laboratorio Nacional de Genómica de la Biodiversidad, CINVESTAV, Irapuato, Mexico.
authors.forename: T A
authors.initials: TA
authors.lastname: Markow
authors.affiliation: CNRS UMR7592, Institut Jacques Monod, Université Paris Diderot, Paris, France.
authors.forename: V
authors.initials: V
authors.lastname: Orgogozo
mesh_terms: D000818:Animals; D004330:Drosophila / Q000145:classification / Q000235:genetics*; D014644:Genetic Variation; D008800:Mexico; D008969:Molecular Sequence Data; D010802:Phylogeny
keywords: asymmetric male genitalia; molecular phylogeny; multilocus analysis; nannoptera species group; reproductive characters; species divergence estimates