Cibele S. Ribeiro-Costa

Desenvolvimento de Zabrotes subfasciatus (Boh.) (Coleoptera: Chrysomelidae, Bruchinae) em genótipos de Phaseolus vulgaris L. (Fabaceae) cultivados no Estado do Paraná e contendo arcelina

O presente trabalho objetivou avaliar o desenvolvimento de Zabrotes subfasciatus (Boh.), praga de graos armazenados, em genotipos de feijoeiro (Phaseolus vulgaris L.) comumente cultivados no Parana e com arcelina, e a possivel resistencia desses materiais ao bruquineo. Foram realizados testes em laboratorio (27oC, 50 ± 10% UR, fotofase 12h) com os genotipos TPS-Bionobre, IAC-Una, IPR-Uirapuru, IAPAR 44, IPR Juriti, IAPAR 81, Perola, Carioca e Bolinha, alem de dois outros contendo arcelina, Arc 1 e Arc 2. Os genotipos com os alelos Arc 1 e 2 sugerem resistencia do tipo antibiose, com elevada mortalidade das fases imaturas, e Arc 1, com periodo de desenvolvimento prolongado e drastica reducao de peso de machos e femeas. A resistencia do tipo nao-preferencia para oviposicao nao foi observada para estes dois genotipos. Dentre os genotipos sem arcelina, IAPAR 44 destacou-se como o mais resistente a Z. subfasciatus, pois foi o menos preferido para oviposicao, promovendo baixo percentual de ovos viaveis, longo periodo de desenvolvimento e reduzido peso de machos e femeas. As cultivares Perola, IPR Juriti e Bolinha foram os mais suscetiveis, com alto numero de ovos e ovos viaveis, alem de baixa porcentagem de mortalidade de fases imaturas.

Fauna de Alticini (Newman) (Coleoptera, Chrysomelidae, Galerucinae) em diferentes estágios sucessionais na Floresta com Araucária do Paraná, Brasil: diversidade e estimativa de riqueza de espécies

Alticini (Newman) (Coleoptera, Chrysomelidae, Galerucinae) fauna in different successional stages in an Araucaria Forest of Parana, Brazil: diversity and estimation of species richness. Members of the Alticini were collected at five locations: an edge, an area of unmanaged Araucaria reforestation, and in three successional stages of Araucaria Forest in the state of Parana. Collecting, using malaise traps, was carried out weekly from September 1999 to August 2001, in Vila Velha State Park, near the city of Ponta Grossa, Parana. Collections included 1,891 specimens of 106 species in the Alticini. The highest richness and the lowest species abundance were in the forest margin. Richness was highest in young, and lowest in older successional stages. The richness estimators indicated a possible increase of seven to 50 Alticini species in Vila Velha. The proportional abundance of Chrysomelidae/Coleoptera decreases with increasing degree of succession, and therefore may serve as an indicator of environmental quality.

Seasonality and temporal structuration of Alticini community (Coleoptera, Chrysomelidae, Galerucinae) in the Araucaria Forest of Parana, Brazil

Seasonality was studied for Alticini trapped with malaise over a period of two years in the Vila Velha State Park, Parana, Brazil. Coleoptera, Chrysomelidae and Alticini showed seasonal distribution, with the highest abundance during spring and summer months. The abundance peaks of these groups were not synchronized. Of all environmental variables tested, photoperiod had the larger effect on the distributional patterns of Coleoptera, Chrysomelidae and Alticini. Also, Chrysomelidae and Alticini probably are related to the quality and availability of host-plants. When richness was high there was a greater similarity among seasons of different years. However, when richness was not pronounced, seasons showed more similarity within the same year than between years. The Alticini community was seasonally structured and a possible mechanism underlying this pattern is asymmetric competition. Nevertheless, it is necessary to account for indirect interactions (plant-enemy mediated) to better understand how Alticini community is structured.

Spatio-temporal dynamics of Alticini (Coleoptera, Chrysomelidae) in a fragment of Araucaria Forest in the state of Parana, Brazil.

Alticini fauna from five areas, two with different types of management (Borda and Araucaria) and three with different levels of conservation (Fase 1, Fase 2 and Fase 3), in the Araucaria Forest of the Parana was captured with malaise traps. The material was collected weekly, from September/1999 to August/2001, in the Parque Estadual of Vila Velha, Ponta Grossa. 1,891 individuals of 106 Alticini species were collected with only seven species common to all areas. Despite the proximity between sampling areas, the number of species shared between pairs of areas was low, not reaching 40%, with the Araucaria and Fase 1 areas being the most similar. The community structure of the areas Fase 1 and Fase 2 were most related. Fase 1, in initial stage of succession, showed the largert variation in the abundance and richness from one year to another.

Comportamento de oviposição de Bruchidae (Coleoptera) predadores de sementes de Cassia leptophylla Vogel (Caesalpinaceae), morfologia dos ovos e descrição de uma nova espécie

Sennius leptophyllicola sp. nov. is described from Parana, Brazil and reported to feed in seeds of Cassia leptophylla Vogel with Pygiopachymerus lineola (Chevrolat, 1871). Both species attach their eggs to the outside of the fruit valves of the host. Their oviposition behavior places them in oviposition guild A of JOHNSON (1981). Eggs were described based upon scanning electron micrographs.

Morfologia comparada dos gêneros do grupo Merobruchus (Coleoptera: Chrysomelidae: Bruchinae): diagnoses e chave

A comparative analysis was carried out based on the detailed morphology of adults of seven genera: Caryedes Hummel, 1827, Ctenocolum Kingsolver & Whitehead, 1974, Gibbobruchus Pic, 1913, Meibomeus Bridwell, 1946, Merobruchus Bridwell, 1946, Penthobruchus Kingsolver, 1973, and Pygiopachymerus Pic, 1911, joined in the Merobruchus group. This group is included in Acanthoscelidina Bridwell, the largest subtribe of Bruchinae, and with imprecise limits. This study describes new characters, suggests a new hypothesis for the relationships among the genera, proposes diagnoses of the group and its genera, and provides a dichotomous key. It was also possible to record Caryedes godmani (Sharp, 1885) and Caryedes longifrons (Sharp, 1885) for the first time from Brazil and Dioclea virgata (Rich.) Amshoff (Papilionoideae) as a new host plant for C. godmani.

Predação de sementes de Senna multijuga (Rich.) H.S. Irwin & Barneby (Caesalpinaceae) por bruquíneos (Coleoptera: Chrysomelidae)

Senna multijuga Rich. I. & B. (Caesalpinaceae) is an ornamental tree common in southeastern Brazil. To quantify the seed damage of bruchine species in this host plant, fruits were collected from 31 March to 30 May 2000 and stored in greenhouse, until emergence of the bruchines, which were then identified. Emerged beetles in these samples were 67% Sennius crudelis Ribeiro-Costa & Reynaud, 20% Sennius puncticollis (Fahraeus) and < 1% Sennius nappi Ribeiro-Costa & Reynaud. Finally, 62% of seeds were undamaged, 26% were empty, 12% were damaged and the sum of empty and damaged seeds was 38%. Considering that other factors decrease seed germination, as pathogens and unfavorable weather conditions, this last pencentage may be very expressive. On the other hand, S. multijuga probably is related with strategies of dispersion and escape from predators as the small and numerous seed crops, which can minimize the losses caused by insect seed eaters. Here we highlight the need to study more fruitfication phases and to conduct germination seed tests to better understand the influence of Bruchinae predation on the S. multijuga reproductive capacity.

Insects Associated with Seeds of Lonchocarpus muehlbergianus Hassl. (Fabaceae) in Tres Barras, Parana, Brazil

To find the insects associated with seeds of a Brazilian native leguminous plant, Lonchocarpus muehlbergianus Hassl., fruits were collected from isolated trees in Tres Barras, Parana, Brazil. A sample of 500 g of fruits with 2353 seeds was evaluated in the laboratory. It was found that 77.4% of the seeds were not damaged by insects, 12.4% of the seeds were damaged and 10.2% of the seeds were empty. The bruchid species Ctenocolum crotonae (Fahraeus) was detected for the first time in this plant. This species was recorded in Mato Grosso, Brazil and, in this paper, the geographical distribution is amplified to include Parana State. Horismenus missouriensis Ashmead (Hymenoptera: Eulophidae) was also observed in the sample and it is probably a parasitoid of the bruchid larva or pupa. Of the 2353 seeds, 4.9% were damaged by C. crotonae and 4.6% had emergence holes of H. missouriensis. Larvae of Tenebrionidae and Curculionidae were also detected feeding on the seeds, representing 2.8% of the total number of the seeds.

Phylogeny and revision of the New World seed-feeding bruchine genus Gibbobruchus Pic (Coleoptera: Chrysomelidae).

Abstract. Gibbobruchus Pic, 1913 belongs to the subtribe Acanthoscelidina, which encompasses ∼50% of the subfamily Bruchinae (Coleoptera : Chrysomelidae). These species are distributed in the Americas and are mainly associated with Bauhinia seeds (Fabaceae). The monophyly of Gibbobruchus and its species groups were tested based on 26 adult morphological characters and 15 taxa. Of these taxa, 13 species were recognised including two new species, G. vinicius, sp. nov. and G. bolivianus, sp. nov. Gibbobruchus is monophyletic and supported by seven synapomorphies. The currently proposed composition of species groups is: Group speculifer: G. speculifer, G. ornatus, G. vinicius, Manfio & Ribeiro-Costa, sp. nov.; Group polycoccus: G. polycoccus; Group wunderlini: G. wunderlini; Group scurra: G. cavillator, G. bolivianus, Manfio & Ribeiro-Costa, sp. nov., G. scurra; and Group mimus: G. guanacaste, G. iturbidensis, G. mimus, G. cristicollis, G. divaricatae. A lectotype is designated for G. triangularis and a neotype for G. mimus; two new synonyms are proposed: Gibbobruchus cavillator (Fåhraeus, 1839) = Gibbobruchus triangularis (Pic, 1926) syn. nov. = Gibbobruchus nigronotatus (Pic, 1931) syn. nov. Four species have new distribution records. An identification key for the species, descriptions, redescriptions, and illustrations, are also provided.

Sennius Bridwell (Coleoptera, Bruchidae): new species predators of seeds of Chamaecrista Moench (Caesalpinaceae) from Serra do Cipó, Santana do Riacho, Minas Gerais, Brazil

The four new species Sennius bruneus sp. nov., S. kingsolveri sp. nov., S. maculatus sp. nov. and S. niger sp. nov., predators of seeds of Chamaecrista Moench (Caesalpinaceae) from Serra do Cipo, Santana doRiacho, Minas Gerais, Brazil are described, and their host species listed. A key to the four species is also included.