Microsatellite and Mitochondrial Data Provide Evidence for a Single Major Introduction for the Neartic Leafhopper Scaphoideus titanus in Europe

Scaphoideus titanus, a leafhopper native to North America and invasive in Europe, is the vector of the Flavescence dorée phytoplasma, the causal agent of the most important form of grapevine yellows in European vineyards. We studied 10 polymorphic microsatellite loci and a 623 bp fragment of the mitochondrial cytochrome oxidase II gene in native S. titanus from north-eastern America and introduced European populations, to elucidate the colonization scenario. Consistent with their recent history, invasive European populations were less genetically diverse than American populations for both types of markers, suggesting a recent bottleneck. Significant isolation by distance was detected between American populations but not between European populations. None of the European mitochondrial haplotypes was found in the American vineyards, from which they are assumed to have originated. The precise source of the invasive S. titanus populations therefore remains unclear. Nevertheless, the high heterozygosity of North-East American populations (which contained 92% of the observed alleles) suggests that this region is part of the native range of S. titanus. Clustering population genetics analyses with microsatellite and mitochondrial data suggested that European populations originated from a single introduction event. Most of the introduced populations clustered with populations from Long Island, the Atlantic Coast winegrowing region in which Vitis aestivalis occurs

A new South American genus of Iassinae (Hemiptera: Cicadellidae) and additional morphological characters for two Neotropical species of Neobalinae and Nioniinae

The new iassine leafhopper genus Ana gen. nov is described, based on the type species Ana doctrix sp. nov. from Argentina, and placed in the tribe Hyalojassini. The new genus is distinguished from other Neotropical Hyalojassini genera by setose forewings, submarginal vein evanescent apically and appendix narrower than first apical cell, male pygofer with a triangular expansion turned mesad on ventral margin, lacking hooks, styles bifid basally, and female sternite VII short, with posterior margin concave. The subfamilies Neobalinae and Nioniinae are recorded for the first time from Argentina. New female morphological characters of Calliscarta fasciata (Osborn) (Neobalinae) and the male terminalia of Nionia major(Osborn) (Nioniinae) are provided. An updated key to the 12 subfamilies of Cicadellidae present in Argentina is provided.Fil: Defea, Bárbara Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; ArgentinaFil: Paradell, Susana Liria. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Entomología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin