0.05). It has been demonstrated that most of the species found in native vegetation occur also in the eucalypt plantations, although these ones present a drastic diminution of the species density, suggesting that the ant regional richness do not depend on the complexity of the habitat, because the cerrado ant fauna is well conserved in the eucalypt plantations, contradicting most of the literature on this subject.]]>
Species of the genus Acropyga are rarely encountered subterranean ants that rely on mealybugs or aphids to provide their nutritional needs. Female Acropyga (Formicinae) alates of pantropical and Mediterranean species carry mealybugs with their mandibles while swarming and probably inoculate their new nests with these mealybugs. The natural history of Acropyga and other mealybug-tending ant species, a summary of the various reports of Acropyga females toting mealybugs, and a new record from French Guiana are presented here. Also provided are a first report and description of Acropyga alates with mealybugs in Dominican amber dated to the Miocene, a discovery indicating that this intimate association and relatively uncommon behavior has existed for at least 15-20 million years. The mealybugs found with the Acropyga females in amber are related to the hypogaeic genera Eumyrmococcus Silvestri and Neochavesia Williams & Granara de Willink (Pseudococcidae, Rhizoecinae) and represent three new species of a new genus. The genus Electromyrmococcus and the species Electromyrmococcus abductus Williams, Electromyrmococcus inclusus Williams and Agosti, and Electromyrmococcus reginae Williams are described. A piece of Dominican amber containing workers of Azteca alpha Wilson (Dolichoderinae) and 23 scale insects is also presented and the significance of these specimens in Dominican amber is discussed.
ABSTRACT. Composition of Formicidae community (Insecta, Hymenoptera) in the canopy of Attalea phalerata Mart. (Arecaceae), in the Pantanal of Poconé, Mato Grosso, Brazil. Three individuals of the palm Attalea phalerata Mart. (Arecaceae) were sampled using the method of canopy fogging, during the aquatic phase (high water) in the Pantanal of Mato Grosso (February 2001). The objective was to evaluate the diversity, feeding habits and spatial distribution of the Formicidae community in the canopy of this monodominant palm species, typical of this region. Each of three palms was fogged once, then resampled first by shaking fronds while attached, then by washing all fronds (cut then washed). A total of 966 ants belonging to 6 subfamilies, 13 tribes and 29 species was obtained in the 49 m 2 sampling area (19.7±52.7 individuals/m 2 ) representing 3.9% of all arthropods sampled. Myrmicinae was the most representative subfamily, with 6 tribes and 14 species, with Solenopsidini (5 species) distinguishing. Formicinae was the second most abundant subfamily, with 3 tribes and 8 species. Pheidole sp. 2 was dominant in the total catch (284 individuals; 29.4% of the total captured) followed by Camponotus (Myrmobrachys) crassus (182 individuals; 18.8%) and Crematogaster (Orthocrema) sp. 1 nr. quadriformis (119 individuals; 12.3%). The values of the diversity indices were significant (H'=2.185; D= 0.835), although they showed low values of equitability (0.649 and 0.248, respectively). This demonstrated the heterogeneity of the Formicidae community associated with the canopy of this palm. An analysis of spatial distribution showed that the greatest abundance and richness of Formicidae occurred in the central region of the crown, next to the trunk. KEYWORDS. Attalea phalerata; canopy; diversity; Formicidae; Pantanal. RESUMO.Composição da comunidade de Formicidae (Insecta, Hymenoptera) em copas de Attalea phalerata Mart. (Arecaceae), no Pantanal de Poconé, Mato Grosso, Brasil. Três indivíduos da palmeira Attalea phalerata Mart (Arecaceae) foram amostrados durante a fase aquática (cheia) no Pantanal de Mato Grosso (fevereiro/2001) utilizando-se a metodologia de nebulização de copas "canopy fogging". Este estudo objetivou avaliar a diversidade, hábitos alimentares e a distribuição espacial da comunidade de Formicidae em copas dessa palmeira que forma adensamentos monodominantes, típicos nessa região. Cada palmeira foi nebulizada uma única vez e realizadas três coletas subseqüentes. Um total de 966 formigas, pertencentes a 6 subfamílias, 13 tribos e 29 espécies foram amostradas em 49 m 2 de área amostral (19,7±52,7 indivíduos/ m 2 ) representando 3,9% do total de artrópodes obtidos. Myrmicinae foi a subfamília mais representativa, com 6 tribos e 14 espécies, destacando-se Solenopsidini com 5 espécies. Formicinae foi a segunda subfamília mais abundante com 3 tribos e 8 espécies. Pheidole sp. 2 foi dominante na amostragem geral (284 indivíduos; 29,4% da captura total) seguida por Camponotus (Myrmobrachys) crassus (182 individuos; 18,8%) ...
We present hereafter a protocol to test attractiveness of new formulations of granulated baits used against leaf-cutting ants (Acromyrmex spp. and Atta spp.) in the field. Its purpose is to standardize the methodology, thus making possible further comparison of results wherever these tests are carried out.
All the contents of this work, except where otherwise noted, is licensed under a Creative Commons Attribution 4.0 International license.Todo o conteúdo deste trabalho, exceto quando houver ressalva, é publicado sob a licença Creative Commons Atribição 4.0.Todo el contenido de esta obra, excepto donde se indique lo contrario, está bajo licencia de la licencia Creative Commons Reconocimento 4.0.
SciELO Books / SciELO Livros / SciELO Libros DELABIE, JHC., et al., orgs. As formigas poneromorfas do Brasil [online]. Ilhéus, BA: Editus, 2015, 477 p. ISBN 978-85-7455-441-9. Available from SciELO Books
Abstract. The aim of this study, which was conducted in French Guiana, was to characterize the karyotypes of nine ant species belonging to the genera Anochetus, Apterostigma, Cyphomyrmex, Camponotus, Gigantiops, Myrmicocrypta, Odontomachus and Pseudomyrmex, and to compare them with published data. We present the fi rst descriptions of the karyotypes of Gigantiops destructor (Fabricius), an endemic Formicinae of the Amazonian region, which is the only living species in the tribe Gigantiopini, and of a species from the poorly-known cryptic genus Myrmicocrypta, which belongs to the Myrmicinae tribe Attini. Résumé. Le caryotype de Gigantops destructor (Fabricius) et d'autres fourmis de Guyane Française (Formicidae
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