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ABSTRACT In this study, we investigated the chromosomes of three species of Sicarius spiders from the Brazilian Caatinga, using classical and molecular cytogenetic techniques. Based on the phylogenetic approach, we also discussed about the variation of diploid number, types of sex chromosome system and changes in the localization of ribosomal genes of Scytodoidea. Sicarius are Synspermiata spiders that together with the genera Loxosceles and Hexophthalma constitute the family Sicariidae. In this group, the available cytogenetic data showed a low diploid number range (2n♂=18 to 2n♂=23) and the presence of only multiple sex chromosome systems (X1X2Y and X1X20). Mitotic metaphase cells exhibited 2n♂=16+X1X2Y for Sicarius cariri and S. ornatus, and 2n♂=18+XY for S. tropicus. In these species, silver impregnation revealed nucleolar organizer region (Ag-NOR) on the terminal region of pair 1. In S. ornatus and S. tropicus, the results obtained with fluorescent in situ hybridization (FISH) using 18S rDNA probe were similar to Ag-NOR, however in S. cariri, the ribosomal sites were localized in the terminal region of the X1 sex chromosome. In this work, we presented the first description of a simple sex chromosome system for Sicariidae, helping to understand how the XY sex chromosome system evolved from the X1X2Y system. Additionally, FISH data incongruous with Ag-NOR indicate that the cytogenetic studies in Sicariidae allow investigating the relation between the karyotype evolution and the distribution and the activity of rDNA genes.

RESUMEN En este estudio, investigamos los cromosomas de tres especies de arañas Sicarius de la Caatinga brasileña, utilizando técnicas de citogenética clásica y molecular. Usando un enfoque filogenético, también discutimos la variación del número diploide, los tipos de sistema cromosómico sexual y los cambios en la localización de los genes ribosómicos en Scytodoidea. Los Sicarius son arañas Synspermiata que, junto con los géneros Loxosceles y Hexophthalma, constituyen a la familia Sicariidae. En este grupo, los datos citogenéticos disponibles mostraron un rango de número diploide bajo (2n♂=18 a 2n♂=23) y únicamente la presencia de sistemas de cromosomas sexuales múltiples (X1X2Y y X1X20). Las células mitóticas en metafase mostraron 2n♂=16+X1X2Y para Sicarius cariri y S. ornatus, y 2n♂=18+XY para S. tropicus. En estas especies, la impregnación de plata reveló la región organizadora nucleolar (Ag-NOR) en la región terminal del par 1. En S. ornatus y S. tropicus, los resultados obtenidos con la hibridación in situ fluorescente (FISH) utilizando la sonda de ADNr 18S fueron similares a los de Ag-NOR, sin embargo, en S. cariri los sitios ribosomales se localizaron en la región terminal del cromosoma sexual X1. En este trabajo, presentamos la primera descripción de un sistema cromosómico sexual simple para Sicariidae, ayudando a entender cómo el sistema cromosómico sexual XY evolucionó a partir del sistema X1X2Y. Además, los datos de FISH incongruentes con Ag-NOR indican que los estudios citogenéticos en Sicariidae permiten investigar la relación entre la evolución del cariotipo y la distribución y la actividad de los genes de ADNr.

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As large amounts of natural environments are lost due to urbanization, the role of remnant native vegetation in the preservation of biodiversity has become even more significant. Remnant native forest patches are essential refugia for flora and fauna and are crucial for the maintenance of ecosystem processes in urbanized landscapes. We evaluated the influence of landscape structure on ants and spiders associated with Atlantic Forest remnants in urban landscapes. We sampled 14 forest areas in the Metropolitan Region of Salvador and tested the effect of the landscapes' proportion of forest cover, mean landscape isolation, and mean landscape shape complexity on the taxonomic and functional richness and the community composition of both groups. The species collected were classified into functional groups based on behavioral attributes and environmental preferences. Overall, there were strong adverse effects of forest loss, decreased connectivity, and an increase in edge effects associated with the mean shape complexity of the forest remnants. However, the spiders responded to all three landscape structure characteristics whereas the ants only responded to the landscape mean shape complexity. Our findings indicate that the maintenance of urban forest habitats is essential for the conservation of biodiversity in the Metropolitan Region of Salvador and the preservation of ecological functions performed by species within the forest areas.

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In Chile, all necrotic arachnidism is attributed to the Chilean recluse spider Loxosceles laeta (Nicolet) (Araneae: Sicariidae). It is predated by the spitting spider Scytodes globula (Nicolet) (Araneae: Scytodidae). The biology of each of these species is not well known and it is important to clarify their distributions. The aims of this study are to elucidate the variables involved in the niches of both species based on environmental and human footprint variables, and to construct geographic maps that will be useful in estimating potential distributions and in defining a map of estimated risk for loxoscelism in Chile. Loxosceles laeta was found to be associated with high temperatures and low rates of precipitation, whereas although S. globula was also associated with high temperatures, its distribution was associated with a higher level of precipitation. The main variable associated with the distribution of L. laeta was the human footprint (48.6%), which suggests that this is a highly invasive species. Similarly to other species, the distribution of L. laeta reaches its southern limit at the Los Lagos region in Chile, which coincides with high levels of precipitation and low temperatures. The potential distribution of L. laeta in Chile corresponds to the distribution of cases of loxoscelism.

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We made a cytogenetic analysis of four species of Oxyopidae and compared it with the karyotype data of all species of this family. In Hamataliwa sp, the mitotic cells showed 2n♂ = 26+X(1)X(2) and telocentric chromosomes. The 2n♂ = 28, which has been described for only one oxyopid spider, is the highest diploid number reported for this family. Peucetia species exhibited distinct karyotype characteristics, i.e., 2n♂ = 20+X(1)X(2) in P. flava and 2n♂ = 20+X in P. rubrolineata, revealing interspecific chromosome variability within this genus. However, both Peucetia species exhibited telocentric chromosomes. The most unexpected karyotype was encountered in Oxyopes salticus, which presented 2n♂ = 10+X in most individuals and a predominance of biarmed chromosomes. Additionally, one male of the sample of O. salticus was heterozygous for a centric fusion that originated the first chromosomal pair and exhibited one supernumerary chromosome in some cells. Testicular nuclei of Hamataliwa sp and O. salticus revealed NORs on autosomal pairs, after silver impregnation. The majority of Oxyopidae spiders have their karyotype differentiated by both reduction in diploid number chromosome number and change of the sex chromosome system to X type; however, certain species retain the ancestral chromosome constitution 2n = 26+X1X2. The most remarkable karyotype differentiation occurred in O. salticus studied here, which showed the lowest diploid number ever observed in Oxyopidae and the second lowest registered for Entelegynae spiders.

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number chromosome number and change of the sex chromosomesystem to X type; however, certain species retain the ancestralchromosome constitution 2n = 26+X1X2. The most remarkablekaryotype differentiation occurred in O. salticus studied here, whichshowed the lowest diploid number ever observed in Oxyopidae andthe second lowest registered for Entelegynae spiders.

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Palpigradi comprises the most poorly known order within the Arachnida; hence, information regarding their biology and behavior is quite scarce. We document an interaction between a palpigrade of the genus Eukoenenia being preyed upon by a spider of the genus Metagonia in the Gruta do Vale, a cave in the municipal district of Felipe Guerra (Rio Grande do Norte, Brazil). The entire prey recognition and capture process by the Metagonia is described in full detail. Both species involved, Eukoenenia potiguar n. sp. and Metagonia potiguar n. sp., are also described. Metagonia potiguar n. sp. is the first Brazilian cave-dwelling Metagonia to be described.

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Acanthoscurria natalensis Chamberlin, 1917 is redescribed. The following species are considered junior synonymsof A. natalensis: A. cursor Chamberlin, 1917, A. fracta Chamberlin, 1917, A. rondoniae Mello-Leitão, 1923, A.chiracantha Mello-Leitão, 1923, and A. parahybana Mello-Leitão, 1926. All examined specimens, including the types,share the same general aspect, morphology of the sexual organs, color, and measurements. Acanthoscurria natalensisresembles A. paulensis Mello-Leitão, 1923 and A. chacoana Brèthes, 1909 in the general aspect, size, and by the morphologyof the sexual organs: male palpal bulb with embolus ending like a shell, due to the prolateral and superior keels.It can be distinguished from these two species by the less developed keels and the longer embolus. The female resemblesA. paulensis and A. chacoana by the fused base of the spermathecae and differs by the more evident lobes,projected from base. The distribution of A. natalensis is expanded to Brazilian states covering the Caatinga and theCerrado biomes.

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Phoneutria bahiensis Simó & Brescovit, 2001 is a large ctenid spider inhabiting the states of Bahia and Espírito Santo, Brazil. Considering that it is probably endemic, this species was included in the Brazilian red book of threatened species. Here, we predict the distribution range of P. bahiensis using 19 bioclimatic variables in the model design. The most septentrional record for this spider was indicated for northern Bahia. The model predicts that the distribution range covers the Atlantic Forest from the state of Paraíba to Rio de Janeiro, with the best suitable area in the Atlantic Forest of the state of Bahia. The bioclimatic variable with the best contribution to the model was precipitation in the driest quarter. Based on collected data, the species inhabits Ombrophilous Forests and Restinga vegetation, two ecosystems of the Atlantic Forest biome. In the best-predicted area of distribution, eleven Conservation Units were included.

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Acanthoscurria natalensis Chamberlin, 1917 is redescribed. The following species are considered junior synonyms of A. natalensis: A. cursor Chamberlin, 1917, A. fracta Chamberlin, 1917, A. rondoniae Mello-Leitão, 1923, A. chiracantha Mello-Leitão, 1923, and A. parahybana Mello-Leitão, 1926. All examined specimens, including the types, share the same general aspect, morphology of the sexual organs, color, and measurements. Acanthoscurria natalensis resembles A. paulensis Mello-Leitão, 1923 and A. chacoana Brèthes, 1909 in the general aspect, size, and by the morphology of the sexual organs: male palpal bulb with embolus ending like a shell, due to the prolateral and superior keels. It can be distinguished from these two species by the less developed keels and the longer embolus. The female resembles A. paulensis and A. chacoana by the fused base of the spermathecae and differs by the more evident lobes, projected from base. The distribution of A. natalensis is expanded to Brazilian states covering the Caatinga and the Cerrado biomes.

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The purpose of our research was to document and discuss the temporal patterns of prey use shown by the trap-nesting wasp Trypoxylon opacum in two different habitats in Southern Brazil. It was carried out from December 2001 to December 2004. Twenty nine species belonging to five families of spiders were captured by T. opacum. Araneidae was the most captured family and has been strongly represented by the genus Eustala. Through Bray-Curtis s coefficient and the unweighted pair group method average (UPGMA), the spiders can be divided into three groups: the smaller group includes the most abundant species (Alpaida sp2, Bertrana rufostriata, Eustala sp1, Eustala sp2, Eustala sp3 and Eustala sp4), the second group includes species with intermediate abundance (Alpaida, Alpaida gracia and Mangora sp2), and the third and largest group includes the less abundant species, (Acacesia villalobosi, Alpaida argenata, Alpaida sp1, Araneus blumenau, Araneus sicki, Crysometa boraceia, Crysometa sp3, Eustala sp8, Eustala sp11, Larinia t-notata, Mangora sp1, Ocrepeira aff gnomo, Sanogasta sp., Sanogasta sp2, Sanogasta sp3, Salticidae sp2, Theridion sp1, Theridion sp2, Wagneriana eupalaestris, Wagneriana iguape). Of 1,053 identified spiders, 362 were captured in the grassland areas and 691 in the swamp, since T. opacum built nests only in these two habitats. The diversity, richness and evenness of spiders in T. opacum nests were higher in grassland than in the swamp.

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The purpose of our research was to document and discuss the temporal patterns of prey use shown by the trap-nesting wasp Trypoxylon opacum in two different habitats in Southern Brazil. It was carried out from December 2001 to December 2004. Twenty nine species belonging to five families of spiders were captured by T. opacum. Araneidae was the most captured family and has been strongly represented by the genus Eustala. Through Bray-Curtisïs coefficient and the unweighted pair group method average (UPGMA), the spiders can be divided into three groups: the smaller group includes the most abundant species (Alpaida sp2, Bertrana rufostriata, Eustala sp1, Eustala sp2, Eustala sp3 and Eustala sp4), the second group includes species with intermediate abundance (Alpaida, Alpaida gracia and Mangora sp2), and the third and largest group includes the less abundant species, (Acacesia villalobosi, Alpaida argenata, Alpaida sp1, Araneus blumenau, Araneus sicki, Crysometa boraceia, Crysometa sp3, Eustala sp8, Eustala sp11, Larinia t-notata, Mangora sp1, Ocrepeira aff gnomo, Sanogasta sp., Sanogasta sp2, Sanogasta sp3, Salticidae sp2, Theridion sp1, Theridion sp2, Wagneriana eupalaestris, Wagneriana iguape). Of 1,053 identified spiders, 362 were captured in the grassland areas and 691 in the swamp, since T. opacum built nests only in these two habitats. The diversity, richness and evenness of spiders in T. opacum nests were higher in grassland than in the swamp.(AU)

O objetivo desta pesquisa foi documentar e discutir o padrão temporal de uso de presas por Trypoxylon opacum em dois ambientes diferentes no Sul do Brasil. Ela foi realizada de dezembro de 2001 a dezembro de 2004. Vinte e nove espécies de aranhas pertencentes a cinco famílias foram capturadas por Trypoxylon opacum. Araneidae foi a família mais capturada e foi fortemente representada pelo gênero Eustala. Pelo coeficiente de Bray-Curtis e pela análise de agrupamento, (UPGMA) as aranhas foram divididas em três grupos: o menor deles, incluindo as aranhas mais abundantes na dieta de T. opacum (Alpaida sp2, Bertrana rufostriata, Eustala sp1, Eustala sp2, Eustala sp3 and Eustala sp4); o segundo com as espécies cujas abundâncias foram intermediárias (Alpaida, Alpaida gracia and Mangora sp2); e o terceiro e maior grupo com as espécies pouco abundantes (Acacesia villalobosi, Alpaida argenata, Alpaida sp1, Araneus blumenau, Araneus sicki, Crysometa boraceia, Crysometa sp3, Eustala sp8, Eustala sp11, Larinia t-notata, Mangora sp1, Ocrepeira aff gnomo, Sanogasta sp., Sanogasta sp2, Sanogasta sp3, Salticidae sp2, Theridion sp1, Theridion sp2, Wagneriana eupalaestris, Wagneriana iguape). Das 1.053 aranhas identificadas, 362 foram capturadas em área de campos naturais e 691 em área de várzea, visto que T. opacum fundou ninhos apenas nestes ambientes. A diversidade, a riqueza e a equitabilidade de aranhas nos ninhos de T. opacum foram maiores nas áreas de campos do que naquelas de várzeas.(AU)

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The purpose of our research was to document and discuss the temporal patterns of prey use shown by the trap-nesting wasp Trypoxylon opacum in two different habitats in Southern Brazil. It was carried out from December 2001 to December 2004. Twenty nine species belonging to five families of spiders were captured by T. opacum. Araneidae was the most captured family and has been strongly represented by the genus Eustala. Through Bray-Curtis´s coefficient and the unweighted pair group method average (UPGMA), the spiders can be divided into three groups: the smaller group includes the most abundant species (Alpaida sp2, Bertrana rufostriata, Eustala sp1, Eustala sp2, Eustala sp3 and Eustala sp4), the second group includes species with intermediate abundance (Alpaida, Alpaida gracia and Mangora sp2), and the third and largest group includes the less abundant species, (Acacesia villalobosi, Alpaida argenata, Alpaida sp1, Araneus blumenau, Araneus sicki, Crysometa boraceia, Crysometa sp3, Eustala sp8, Eustala sp11, Larinia t-notata, Mangora sp1, Ocrepeira aff gnomo, Sanogasta sp., Sanogasta sp2, Sanogasta sp3, Salticidae sp2, Theridion sp1, Theridion sp2, Wagneriana eupalaestris, Wagneriana iguape). Of 1,053 identified spiders, 362 were captured in the grassland areas and 691 in the swamp, since T. opacum built nests only in these two habitats. The diversity, richness and evenness of spiders in T. opacum nests were higher in grassland than in the swamp.

O objetivo desta pesquisa foi documentar e discutir o padrão temporal de uso de presas por Trypoxylon opacum em dois ambientes diferentes no Sul do Brasil. Ela foi realizada de dezembro de 2001 a dezembro de 2004. Vinte e nove espécies de aranhas pertencentes a cinco famílias foram capturadas por Trypoxylon opacum. Araneidae foi a família mais capturada e foi fortemente representada pelo gênero Eustala. Pelo coeficiente de Bray-Curtis e pela análise de agrupamento, (UPGMA) as aranhas foram divididas em três grupos: o menor deles, incluindo as aranhas mais abundantes na dieta de T. opacum (Alpaida sp2, Bertrana rufostriata, Eustala sp1, Eustala sp2, Eustala sp3 and Eustala sp4); o segundo com as espécies cujas abundâncias foram intermediárias (Alpaida, Alpaida gracia and Mangora sp2); e o terceiro e maior grupo com as espécies pouco abundantes (Acacesia villalobosi, Alpaida argenata, Alpaida sp1, Araneus blumenau, Araneus sicki, Crysometa boraceia, Crysometa sp3, Eustala sp8, Eustala sp11, Larinia t-notata, Mangora sp1, Ocrepeira aff gnomo, Sanogasta sp., Sanogasta sp2, Sanogasta sp3, Salticidae sp2, Theridion sp1, Theridion sp2, Wagneriana eupalaestris, Wagneriana iguape). Das 1.053 aranhas identificadas, 362 foram capturadas em área de campos naturais e 691 em área de várzea, visto que T. opacum fundou ninhos apenas nestes ambientes. A diversidade, a riqueza e a equitabilidade de aranhas nos ninhos de T. opacum foram maiores nas áreas de campos do que naquelas de várzeas.

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The Brazilian Savanna Ecoregion (Cerrado) is one of the richest biomes in the world, with a characteristic highly seasonal climate a dry season between May and September and a rainy season from October through April. Ground-dwelling spiders from three Cerrado phytophysiognomies, "campo cerrado", "cerrado" and "cerradão", were sampled using pitfall traps during two years, totaling 111 species and 3,529 individuals. The abundance of individuals and species richness was higher during the wet season. Fifty-eight species were captured exclusively during that period, whereas only nineteen were restricted to the dry season. Only two species were found in all samples. The number of juveniles was higher than the number of adults in all phytophysiognomies and in all species during both seasons. The highest abundance was registered in October and the lowest in April. Overall sex ratio was male-biased in all vegetation types sampled. Distinct climate variables affected the abundance of spiders depending on sex, age and vegetal physiognomy where they were sampled. This study involved the longest sampling of spider abundance and diversity on the ground of a Brazilian Savanna. (

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Although bromeliads can be important in the organization of invertebrate communities in Neotropical forests, few studies support this assumption. Bromeliads possess a three-dimensional architecture and rosette grouped leaves that provide associated animals with a good place for foraging, reproduction and egg laying, as well as shelter against desiccation and natural enemies. We collected spiders from an area of the Atlantic Rainforest, southeastern Brazil, through manual inspection in bromeliads, beating trays in herbaceousshrubby vegetation and pitfall traps in the soil, to test if: 1) species subsets that make up the Neotropical forest spider community are compartmentalized into different habitat types (i.e., bromeliads, vegetation and ground), and 2) bromeliads are important elements that structure spider communities because they generate different patterns of abundance distributions and species composition, and thus amplify spider beta diversity. Subsets of spider species were compartmentalized into three habitat types. The presence of bromeliads represented 41 of the increase in total spider richness, and contributed most to explaining the high beta diversity values among habitats. Patterns of abundance distribution of the spider community differed among habitats. These results indicate that bromeliads are key elements in structuring the spider community and highlight the importance of Bromeliaceae as biodiversity amplifiers in Neotropical ecosystems.

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In this paper we present, for the first time, cytogenetical data on Latrodectus gr. curacaviensis (Theridiidae) from Brazil, as well as the first data on meiosis and sex chromosome system of this genus. Testes were submitted to colchicine, hypotonic, and fixation treatment, and chromosomal preparations were stained with Giemsa solution. The analysis showed 2n=26 telo/acrocentric chromosomes in spermatogonial metaphases. Metaphase I exhibited 12 autosomal bivalents and two sex chromosome univalents (12II+X1X2). All bivalents revealed one terminal chiasma. Metaphases II confirmed the sex chromosome system, showing 12 autosomes or 12 autosomes plus two X chromosomes, respectively. Male karyotype prevailing in theridiids is formed by 2n=22 chromosomes, including sex chromosome system X1X2 in all species. The Latrodectus species of the geometricus clade analyzed until now showed smaller diploid number (2nŠ=16 and 2nŠ=18) than the species of the mactans clade (2nŠ=24 and 2nŠ=26). Thus, according to the chromosome number, the examined Latrodectus species seems to be related to the mactans clade.

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Toca new genus is proposed to include two new species: the type species T. bossanova new species from Rio de Janeiro, Brazil, and T. samba new species from Parana and Minas Gerais, Brazil. Toca may be related to Caloctenus Keyserling and Gephyroctenus Mello-Leitao, with which it shares the scales on the abdominal dorsum and the epigynum as a single, slightly sclerotized, fold. The genus can be distinguished among the Calocteninae genera by its unique genital structures.

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This study was carried out in the Parque Municipal das Araucárias, in the municipality of Guarapuava, southern Brazil. A total of 449 T. lactitarse nests were collected using trap-nests of different diameters. Fifty three species of spiders belonging to 7 families were captured by T. lactitarse. Araneidae was the most captured family and has been strongly represented by the genus Eustala. Through Bray-Curtis's coefficient and the unweighted pair group method average (UPGMA), the spiders species can be divided into 3 groups: the smaller group includes the most abundant species (Eustala sp1, Eustala sp2, Acacesia villalobosi, Alpaida sp1 and Araneus corporosus), the second group includes species with intermediate abundance (Wagneriana iguape, Araneus omnicolor, Eustala sp4, Alpaida grayi, Eustala sp3, Larinia t-notata, Mangora sp1 and Wagneriana iguape), and the third and largest group includes the least abundant species (Aysha gr. brevimana 1, Eustala sp5, Wagneriana eupalaestra, Alpaida scriba, Alpaida veniliae, Araneus aff. omnicolor, Araneus sicki, Eustala sp8, Mangora sp2, Mangora sp3, Wagneriana juquia, Alpaida sp2, Araneus blumenau, Eustala sp6, Eustala sp7 and Ocrepeira galianoae). Of 2,029 identified spiders, 1,171 were captured in the Araucaria forest, 612 in grassland areas and 246 in the swamp. Grassland and swamp areas evidenced greater similarity between them than to the Araucaria Forest, regarding presence-absence of spider species in T. lactitarse's diet, as well as regarding species abundance in these habitats. The juvenile number (56%) was significantly higher than the female (38%) and male (6%) percentages.

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This study was carried out in the Parque Municipal das Araucárias, in the municipality of Guarapuava, southern Brazil. A total of 449 T. lactitarse nests were collected using trap-nests of different diameters. Fifty three species of spiders belonging to 7 families were captured by T. lactitarse. Araneidae was the most captured family and has been strongly represented by the genus Eustala. Through Bray-Curtis's coefficient and the unweighted pair group method average (UPGMA), the spiders species can be divided into 3 groups: the smaller group includes the most abundant species (Eustala sp1, Eustala sp2, Acacesia villalobosi, Alpaida sp1 and Araneus corporosus), the second group includes species with intermediate abundance (Wagneriana iguape, Araneus omnicolor, Eustala sp4, Alpaida grayi, Eustala sp3, Larinia t-notata, Mangora sp1 and Wagneriana iguape), and the third and largest group includes the least abundant species (Aysha gr. brevimana 1, Eustala sp5, Wagneriana eupalaestra, Alpaida scriba, Alpaida veniliae, Araneus aff. omnicolor, Araneus sicki, Eustala sp8, Mangora sp2, Mangora sp3, Wagneriana juquia, Alpaida sp2, Araneus blumenau, Eustala sp6, Eustala sp7 and Ocrepeira galianoae). Of 2,029 identified spiders, 1,171 were captured in the Araucaria forest, 612 in grassland areas and 246 in the swamp. Grassland and swamp areas evidenced greater similarity between them than to the Araucaria Forest, regarding presence-absence of spider species in T. lactitarse's diet, as well as regarding species abundance in these habitats. The juvenile number (56 percent) was significantly higher than the female (38 percent) and male (6 percent) percentages.

Este estudo foi realizado no Parque Municipal das Araucárias, município de Gurarapuava, Sul do Brasil. Através de ninhos armadilhas de diferentes diâmetros, foram coletados 449 ninhos de Trypoxylon lactitarse. Cinqüenta e três espécies de aranhas pertencentes a 7 famílias foram capturadas por T. lactitarse. Araneidae foi a família mais freqüente, sendo fortemente representada pelo gênero Eustala. Através do índice de Bray-Curtis e do método de agrupamento (UPGMA), as espécies de aranhas foram divididas em três grupos: o primeiro e menor deles, formado pelas espécies abundantes (Eustala sp1, Eustala sp2, Acacesia villalobosi, Alpaida sp1 e Araneus corporosus); o segundo, pelas espécies intermediárias (Wagneriana iguape, Araneus omnicolor, Eustala sp4, Alpaida grayi, Eustala sp3, Larinia t-notata, Mangora sp1 e Wagneriana iguape); e o terceiro e maior deles, pelas espécies menos abundantes (Aysha gr. brevimana 1, Eustala sp5, Wagneriana eupalaestra, Alpaida scriba, Alpaida veniliae, Araneus aff. omnicolor, Araneus sicki, Eustala sp8, Mangora sp2, Mangora sp3, Wagneriana juquia, Alpaida sp2, Araneus blumenau, Eustala sp6, Eustala sp7 e Ocrepeira galianoae). Das 2.029 aranhas identificadas, 1.171 foram capturadas na mata de araucárias, 612 no campo e 246 na várzea. As áreas de campo e várzea foram as mais similares entre si, tanto com relação à presença e ausência, quanto com relação à abundância de espécies de aranhas na dieta de T. lactitarse. O número de jovens (56 por cento) foi significativamente maior que a de fêmeas (38 por cento) e de machos (6 por cento).

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The female of Zimiromus hortenciae Buckup & Brescovit, 1993 is described for the first time and Trachyzelotes kulczynskii (Bösemberg, 1902), a species introduced from Europe, is recorded for the first time on the island of Fernando de Noronha, state of Pernambuco. The latter, along with T. lyonneti (Audouim, 1826) recorded from the state of Rio Grande do Sul, is the second species of this genus to be reported from Brazil. The spiders were collected with pitfall traps in five points of the island. Ecological data showed that Gnaphosidae was the fifth best sampled spider family, with 179 specimens, belonging to two species, T. kulczynskii and Z. hortenciae. Trachyzelotes kulczynskii was the most abundant with 118 adults while Z. hortenciae was represented by only 21 adults. Both species were collected during the dry and wet seasons but T. kulczynskii was more abundant during the wet season while Z. hortenciae was more abundant during the dry season. The male:female ratio for the dry season was similar for both species but in the wet season it was three times higher for T. kulczynskii.

A fêmea de Zimiromus hortenciae Buckup & Brescovit, 1993 é descrita pela primeira vez. Trachyzelotes kulczynskii (Bösemberg, 1902), uma espécie de origem européia, é registrada pela primeira vez na Ilha de Fernando de Noronha, no estado de Pernambuco. Junto com T. lyonneti (Audouin, 1826), já registrado para o estado do Rio Grande do Sul, Brasil, é a segunda espécie do gênero introduzida no Brasil. As aranhas foram coletadas com armadilhas de solo em cinco pontos da ilha e os dados ecológicos detectados para Gnaphosidae foram de que esta foi a quinta família melhor amostrada dentre Araneae, com 179 espécimes de duas espécies, T. kulczynskii e Z. hortenciae. Trachyzelotes kulczynskii foi mais abundante com 118 adultos enquanto Z. hortenciae teve 21 adultos coletados. Ambas foram coletadas nas estações seca e chuvosa, sendo que T. kulczynskii foi mais abundante na estação chuvosa enquanto Z. hortenciae o foi na estação seca. A proporção de machos e fêmeas foi similar na estação seca, mas na estação chuvosa a proporção de T. kulczynskii foi três vezes maior.

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RESUMEN

Six mygalomorph spiders species belonging to two families, were collected in the Centro de Pesquisa e Conservação da Natureza Pró-Mata, São Francisco de Paula, state of Rio Grande do Sul, Brazil. Five of those species, five are new. Microstigmatidae: Xenonemesia araucaria sp. nov., males differ from those of X. platensis Goloboff, 1988 and X. otti Indicatti, Lucas & Brescovit, 2007 by the curved and very long embolus in the male palp. Females differ from the remaining species of the genus in the seminal receptacle very long and sinuous or twisted. Nemesiidae: Acanthogonatus ericae sp. nov. - males resemble those of A. tacuariensis (Pérez-Miles & Capocasale, 1982) and A. quilocura Goloboff, 1995 by the serrated, curved and long embolus but are distinguished by the presence of a flange on the apex of the embolus. Females differ from the remaining Acanthogonatus by the short copulatory ducts, arising from the apex of the basal dome. Stenoterommata arnolisei sp. nov. is distinguished from the remaining species of the genus by the large sub-apical area of bulb, with a great number of keels, extending to the median region in the male palp and by the long copulatory ducts and spermathecae arising from internal border of basal dome in the female genitalia. S. grimpa sp. nov.: males resemble those of S. arnolisei sp. nov. by the shape of the palpal bulb and by the short embolus, but differ in the keels, restricted to the apical region. Females differ from remaining.

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