Several parthenogenetic species of broad-nosed weevils exist, some of them of economic importance because of their pest status. Screening of the maternally inherited Wolbachia bacterium in 29 weevils of the tribe Naupactini, using multilocus sequence typing allowed us to assess a significant correlation between asexuality and infection, and suggests an involvement of Wolbachia in the origin of this reproductive mode. The nine Wolbachia strains retrieved from the Naupactini belong to the B supergroup. Phylogenetic analysis of these strains, along with other 23 strains obtained from arthropods and nematodes, supports previous hypotheses that horizontal transfer of Wolbachia amongst species from unrelated taxa has been pervasive.
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Recognition of species groups of Dejean (Coleoptera: Curculionidae) from Argentina and neighboring countries.
PeerJ
January 2019
División Entomología, Museo de La Plata, FCNyM, CONICET, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina.
Dejean is the most diverse genus of the tribe Naupactini (Curculionidae: Entiminae), with more than 200 species occurring in South America, of which about 40 range in Argentina and neighboring countries. The Argentinean species treated herein were classified into nine groups having different biogeographic patterns: (1) the groups of , and mainly occur in northeastern Argentina (Misiones province) and reach the highest species diversity in the Atlantic and Parana forests of Brazil; (2) the groups of , , and show the highest species diversity in the Chacoan biogeographic province and also occur in the Yungas, Espinal, Monte, Parana forest (Argentina) and Cerrado (Brazil); (3) the groups of and have the highest species diversity in the Pampean biogeographic province, being also present in adjoining areas, mainly Chaco, Espinal, Monte and Parana forest. We provide descriptions, a dichotomous key, habitus photographs and line drawings of genitalia for the identification of the nine species groups, and a list of the Argentinean species from each group, together with their abbreviated synonymies, updated geographic distributions (including six new country records and several state/province records) and host plant associations.
View Article and Find Full Text PDFGame of clones: Is Wolbachia inducing speciation in a weevil with a mixed reproductive mode?
Mol Phylogenet Evol
April 2019
Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, IEGEBA (CONICET-UBA), Intendente Güiraldes y Av. Costanera Norte s/n, 4to. Piso, Pabellón II, Ciudad Universitaria, CI1428 EHA Ciudad Autónoma de Buenos Aires, Argentina.
Parthenogenesis is widely distributed in Metazoa but it is especially frequent in weevils (Coleoptera, Curculionidae) with one fifth of all known cases. Previous studies have shown that in the tribe Naupactini parthenogenetic reproduction most likely originated with an infection of the endoparasitic bacterium Wolbachia pipientis. In particular, Pantomorus postfasciatus possess a mixed reproductive mode: some populations have males while in others they are absent, and females produce clones by thelytoky.
View Article and Find Full Text PDFNew synonymies, new combinations and lectotype designations for weevils in the tribe Naupactini (Coleoptera: Curculionidae: Entiminae).
Zootaxa
October 2018
División Entomología, Museo de La Plata, FCNyM, Universidad Nacional de La Plata, CONICET. Paseo del Bosque s/n, 1900 La Plata, Argentina..
We examined the type material of 15 species of Naupactus Dejean and related genera (Curculionidae: Entiminae), most of them described by Alphonse Hustache (Museum National d'Histoire Naturelle, Paris) and Carl Boheman (Naturhistoriska Riksmuseet, Stockholm). The information associated with the types was compared with the original descriptions, and large series of specimens were examined in order to analyze the variation of each species throughout its range (sexual dimorphism, other kinds of polymorphism or geographic variation). Based on the results of this study we establish seven new combinations, one new placement and nine new synonymies, we make 21 lectotype designations and provide three new country and state records.
View Article and Find Full Text PDFOn the presence of five species of naupactini (Coleoptera: Curculionidae) damaging soybean in Brazil.
Neotrop Entomol
June 2013
División de Entomología, Museo de La Plata, Univ Nacional de La Plata, La Plata, Argentina.
We report five broad-nosed weevils of the tribe Naupactini, Naupactus leucoloma Boheman, Naupactus minor (Buchanan), Naupactus peregrinus (Buchanan), Naupactus tremolerasi Hustache and Pantomorus viridisquamosus (Boheman) (Coleoptera: Curculionidae) damaging soybean plants in the state of Rio Grande do Sul, Brazil. Some of these species are recorded for the first time in Brazil, and they all belong to species groups naturally distributed in the prairies of southern Brazil, Uruguay, Central Argentina and Paraguay. Three of them have been introduced, established and expanded in other countries outside South America.
View Article and Find Full Text PDFPotential geographic distributions and successful invasions of parthenogenetic broad-nosed weevils (Coleoptera: Curculionidae) native to South America.
Environ Entomol
August 2013
División Entomología, Museo de La Plata, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, La Plata, Provincia de Buenos Aires, Argentina.
Ten species of parthenogenetic broad-nosed weevils (Coleoptera: Curculionidae: Entiminae) native to Argentina, southern Brazil, and Uruguay were selected for niche modeling analysis based on climatic data and altitude, to evaluate their potential range expansion inside and outside South America. The selected species belong to five genera of the tribe Naupactini affecting economically important crops. Until present, five of the 10 species analyzed here have invaded prairies and steppes of countries outside South America (Australia, New Zealand, Mexico, United States, and South Africa): Aramigus tessellatus (Say), Atrichonotus sordidus (Hustache), Atrichonotus taeniatulus (Berg), Naupactus leucoloma Boheman, and Naupactus peregrinus (Buchanan).
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