The spider genus Chrosiothes Simon, 1894 currently comprises 21 described species. Spiders of this are mainly known from the Neotropical Region, but poorly studied in Brazil. In paper six new species Brazil: diabolicus species; carajaensis cicuta murici decorus and una female venturosus Marques & Buckup, 1997 is illustrated for first time. Additionally, records Brazil provided C. perfidus niteroi Levi, 1964.

The spider genus Stemmops O. Pickard-Cambridge, 1894, currently comprises 22 described species. Spiders of this are mainly known from the Neotropical Region, but poorly studied in Brazil. In paper five new species Brazilian described: murici species; carauari carajas pains species, and guapiacu Additionally, records Brazil provided for carius Marques & Buckup, 1996 state São Paulo; belavista Mato Grosso do Sul; vicosa Levi, 1964 Alagoas. servus (known Panama) is recorded first time...

The spider family Nesticidae includes 233 species in 13 genera and is distributed almost worldwide (World Spider Catalog, 2016). However, the still poorly known Neotropical Region. genus Nesticus Thorell, 1869 comprises 132 seven subspecies was described based on N. cellulanus (Clerck, 1757), from Europe Meridional South American of were revised by Ott & Lise (2002). More recently, Faleiro Santos (2011) a new state Minas Gerais, Brazil Torres et al. (2016) province Salta, Argentina....

In this paper a new species of Cryptachaea Archer, 1946 based on males and females is described from Brazilian caves: pilar Santanna & Rodrigues, the states Minas Gerais São Paulo. The parana (Levi, 1963) C. schneirlai 1959) are illustrated for first time. uviana synonymized with migrans (Keyserling, 1884). alacris 1884), benivia Rodrigues Poeta, 2015, recorded Brazil; time Bolivia. Additionally, records caves provided parana, Tocantins, Goiás, Gerais, Mato Grosso do Sul Paulo; state...

Three new species of Catharosoma are described from southern Brazil: pedritense n. sp., promatense and ibirapuitense sp.. New records three other species, which considerably extend their distributions, provided, including a redescription the hitherto particularly poorly-known intermedium (Carl, 1902).

The genus Tullgrenella Mello-Leitão, 1941 presently consists of 13 exclusively Neotropical species. In this paper both sexes two new species are described from Bolivia: nadjae sp. nov. and brescoviti female T. guayapae Galiano, 1970 is illustrated for the first time. Additionally, records southern Brazil provided guayapae, serrana 1970, quadripunctata (Mello-Leitão, 1944) yungae 1970.

The spider genus Euryopis Menge, 1868 (Theridiidae) currently comprises 76 described species worldwide and only two from Brazil none for Bolivia. In this paper four new of Bolivia are illustrated: candiota n. sp.; nasuta catarinensis sp. all boliviensis New records provided E. camis Levi, 1963 spinifera O. Pickard-Cambridge, 1895.

We review the genus Erythrocricus Schubart, 1962 based on type material of species sanguineostriatus (Schubart, 1962). propose a new diagnosis, redescribe species, and synonymy combination. In addition, male-based key to both recognized, including electrofasciatus 1957), comb. nov. ex. Rhinocricus, is given.

The araneid genus Larinia Simon currently includes 56 species, eleven of them with New World distribution (World Spider Catalog, 2016). North American species the were revised first time by Levi (1975) and South Harrod et al. (1991). According to these authors there are four known from subtropical America (Larinia bivittata Keyserling 1885; L. montecarlo (Levi, 1988); t-notata (Tullgren, 1905); tucuman Harrod, & Leibensperger, 1991) also tropical (L. ambo 1991; directa (Hentz, 1847);...

The distribution of beta diversity is shaped by factors linked to environmental and spatial control. relative importance both processes in structuring spider metacommunities has not yet been investigated the Atlantic Forest. variance explained purely environmental, spatially structured components was compared for a metacommunity web spiders. study carried out 16 patches Forest southern Brazil. Field work done one landscape mosaic representing slight gradient urbanization. Environmental...

Spiders are one of the most numerous groups terrestrial predators and these found in diverse environments such as agroecosystems nearby areas. Research on spider diversity is important for following changes fauna brought about by management. This work evaluated richness, abundance, species composition similarity between a rice agroecosystem adjacent at different development stages crop. The study area was Estação Experimental do Arroz, Cachoeirinha, Rio Grande Sul state, south Brazil. A...

É apresentada uma lista de 808 espécies aranhas, incluídas em 51 famílias ocorrentes no Rio Grande do Sul, Brasil. São indicados localidade-tipo, municípios ocorrência e a bibliografia taxonômica cada espécie.

A região Neotropical é considerada pouco amostrada com relação à sua araneofauna, carecendo de inventários padronizados que possam servir base para estudos biodiversidade. As aranhas são consideradas como importantes componentes dos ecossistemas florestais e aparentam ser organismos ideais padrões Neste estudo foi efetuado um levantamento da riqueza composição fauna do Parque Estadual Turvo, Rio Grande Sul, Brasil, local protege o único remanescente representativo Floresta Alto Uruguai no...

The adverse effect that insecticides have on spider populations is of major concern since these predators are a component in the biological control rice insect pest populations. This study was designed to determine pyrethroid insecticide, Lambda-cyhalothrin, fields. Treatments consisted plots treated once with insecticide and untreated (control). Spiders were sampled four times per crop year over two period each three sites state Rio Grande dol Sul, Brazil. replicated times. Sweep net...

We evaluated spider guild abundance and vegetation complexity in riparian forests southern Brazil four distinct river basins over 2 yr. compared among rivers, habitats (edges vs. forest interior), against complexity. also assemblages between juvenile adults terms of guilds. Of 42,057 spiders sampled, 79% were juveniles 21% adults. Space-web weaving was the most abundant whereas cursorial hunters least one. Weaving dominated (59% vs 40.58%, respectively). Thirty-four families recorded; ambush...

Abstract Rosette‐shaped plants can amplify the diversity of predator arthropods and act as potential shelters for these animals in grassland ecosystems under grazing effect. Here we evaluated contribution a vertical rosette‐shaped plant ( Eryngium horridum ) to patterns spider functional traits subtropical grasslands different intensities. We used common sub‐shrub Baccharis crispa herbaceous vegetation reference microhabitats. Sampling was conducted 23 plots described according intensity...

Com a intenção de conhecer diversidade da araneofauna relacionada à cultura do arroz, foi realizado um inventário deste agroecossistema ainda pouco estudado em sua biodiversidade. Foram realizadas 17 amostragens na Estação Experimental Arroz (EEA), Instituto Rio Grandense (IRGA), Cachoeirinha, RS (50º58'21"W; 29º55'30"S) entre outubro 2004 e junho 2005, três períodos: antes arroz ser semeado, durante o desenvolvimento após colheita. As coletas foram efetuadas no período matinal utilizando...

The Pampa biome in southern Brazil has grassland areas with high biodiversity. Given the fast advance of Eucalyptus silviculture over this biome, and scant knowledge on soil spider fauna these landscapes, we aimed to provide a first view spiders occurring there quantitatively evaluate differences between two environments. Study included five farms each environments, native plantation. Spider densities were 6.53 (±1.01s.e.) individuals/m­2 3.88 (±0.73) grassland. This could be due finding...

The spider genus Audifia Keyserling, 1884 currently comprises three described species, two species from Brazil and one Guinea-Bissau Congo. In this paper the male of an is illustrated for first time new records are presented genus. laevithorax recorded Bolivia, record Amazonia, reported. semigranosa Simon, 1895 presented.

The composition of the spider fauna riparian forests is insufficiently known. These forests, adjacent to both aquatic and terrestrial environments, are recognised as having important ecosystem functions. We compare assemblages four in different drainage basins, along with their microhabitats (edges forest interior), state Rio Grande do Sul, southern Brazil. Sampling was carried out following rivers: Piratini, municipality Arroio Grande; Camaquã, Cristal; Sinos, Parobé, Maquiné, Maquiné. Two...

The Araneidae is a speciose family including web-spinning spiders that are very abundant in various terrestrial ecosystems. Several studies demonstrate changes vegetation surrounding rivers, streams and brooks affect the associated araneofauna. aim of this research was to compare differences found diversity (abundance richness), composition phenology sampled different habitats four riparian forest catchments southern Brazil. Samples were taken from forests rivers Rio Grande do Sul State:...

Neopisinus gen. nov. é proposto com designação da espécie-tipo Neopisisnus fiapo sp. nov., base em ambos os sexos, do Rio Grande Sul, Brasil. distingue-se de todos gêneros Spintharinae pelo palpo macho enorme condutor trífido, duas projeções afiladas e uma ápice bifurcado; pela forma característica apófise tegular theridioideos um lobo terminal outro dorsal. Nas fêmeas, epígino aberturas inconspícuas junto à fenda transversal no terço anterior e, internamente, por espessamento...