Spatial distribution, burrow morphology, phenology, defensive displays and predation of two theraphosid spiders living in meadows were studied Uruguay. Exhaustive field studies complemented with laboratory observations carried out. Eupalaestrus weijenberghi occurred throughout the country while Acanthoscurria suina only southern half. Both species seemed to be most abundant Uruguay as they live dominant landscape country. Burrows from both showed a similar morphological pattern but terminal...

The parthenogenesis in Tityus trivittatus Kraepelin 1898, is confirmed for the first time, based on progeny of three virgin females raised isolation since their birth. possible and occasional introduction this species into Uruguay discussed.

This paper describes the sexual behavior of Bothriurus buecherli San Martín 1963 and compares it with rest B. prospicuus group. The mating was very similar to other species group, but presented some differences in initial stages, one being a long period inactivity after male grasps female pedipalps. Information includes reference sting, post-partum copulation, an analysis case cannibalism by female.

Abstract Diurnal and nocturnal activity patterns shown by different species will strongly determine the characteristics of signals as well sensory channels used during sexual interactions. Despite this, few studies have experimentally tested effects lighting time day on courtship in arthropods. Previous that wolf spider Schizocosa malitiosa can be active or at night. We whether period affects behavior S. , pairing males females under diurnal conditions. carried out mating trials conditions...

We describe for the first time sexual behavior of Pavocosa gallopavo (Mello-Leitão, 1941) (Lycosidae), analyzing encounters between 25 pairs virgin adult individuals. Both courtship and copulation were brief, averaging 3.66 min 1.74 respectively. Males showed a very conspicuous vigorous courtship, with Leg Shaking Palpal Drumming as most noticeable displays. Females also active during performing Waving well showing some level aggression by displaying Cheliceral Opening Pushes against males....

1. Major floods of riparian and grassland habitats may lead to a shift in the availability resources (e.g., food, space) that produces cascading effects on organisms rely it. After flooding occurs, particularly natural grasslands or agricultural fields, massive aggregative spider webs are occasionally observed. However, given it is an infrequent unpredictable event, seldom reported detail. 2. We characterise two instances web aggregations followed major fields Argentina Uruguay 2015. In...

We report release of silk threads by males Schizocosa malitiosa (Tullgren 1905) during copulation. The is deposited over the female's front legs and near her mouthparts. Possible functions for this behavior could be inhibiting female aggressiveness through chemicals on silk, inducing catalepsy copulation or repelling other males. propose future studies manipulating male to test these hypotheses.

Harvestmen have an extensive list of predators, among which spiders stand out. To avoid predation, harvestmen developed several defensive behaviours, range from attempting not to be detected by their predator releasing chemicals. In this work, our aim was determine are the behaviours adopted four synchronic and sympatric species gonyleptid (Acanthopachylus aculeatus; Pachyloides thorellii, Discocyrtus prospicuus Parampheres bimaculatus) when attacked lycosid Schizocosa malitiosa, a wolf...

In order to study how sexual selection takes place during mating, it is necessary have a clear knowledge of the interactions that occur throughout mating and which morphological behavioral traits are involved. Available information about harvestman reproductive biology mainly restricted anecdotal field observations, most them lacking detailed description quantification behavior. this paper, we behavior gonyleptid Pachyloides thorellii Holmberg, 1878 (Pachylinae) provide quantitative...

The copulation of Schizocosa malitiosa (formerly Lycosa malitiosa) consists two phases insertions: Pattern I (PI) alternating multiple consecutive insertions with each palp, and II (PII) single palp. In experimental manipulations, males copulated first a virgin female (A) until they began the PII, were then removed from female's back placed another (B). Courtship this second was observed, as well copulation, whenever it occurred. Males re-initiated by performing an abbreviated PI (“replay”)...

Lycosa inornata Blackwall, 1862 is a small wolf spider that inhabits open environments from Uruguay and, like other spiders, little known of their sexual behaviour, which we describe here. Male courtship behaviour includes leg rubbing, vibration and pedipalp drumming, as well waving. Females respond to male by running towards them shoving with her legs body. Receptive females lower body on the substrate slightly raise twist abdomen, facilitating mounting subsequent insertions. Copulation...

Spider webs can be invaded by other species of spiders. While the majority involve spiders that build their own, there are reports wandering invading webs. Most wolf (Lycosidae) do not and web invasion behaviour has never been reported in this family. Here, we report Aglaoctenus lagotis, one few We collected observations ten invasions Lycosa erythrognatha, L. poliostoma, Schizocosa malitiosa. discuss possible implications these for moulting speculate safe refuges.

Este artículo presenta una clave para el reconocimiento de las especies escorpiones halladas en Uruguay. Asimismo, se brinda información sobre su comportamiento, biología, distribución e importancia médica.

The Cerro de Montevideo is a symbolic reference of Uruguay that currently presents an artificialised landscape with environmental deterioration. We used combined techniques including documentary analysis, cartography, remote sensing, biogeographical relict biota, digital recreation and estimated valuation visual fragility to characterise its pre-Hispanic ecological landscape: grassy matrix large patches corridors grasslands woody vegetation, intermediate-level fragility. physiognomic changes...

The family Lycosidae is one of the spider families with greatest diversity species and varied striking strategies. Studies on Neotropical wolf spiders have contributed new valuable information to field sexual selection for several decades, having discovered cases that differ markedly from previously known patterns, not only but in general. Here we provide a review studies reproductive biology South American recent focusing subfamilies Lycosinae, Allocosinae Sossipinae. promising...

Schizocosa malitiosa and Aglaoctenus lagotis are two wolf spiders (Lycosidae) that inhabit grasslands hills of Uruguay. While S. presents a wandering life habit, A. is sedentary, lives in web. In the present study, we experimentally evaluated capture behavior both species on "known" substrate another "unknown" one. To do this, placed (wandering) sand later At same time exposed to (sedentary), web sand. Both captured less preys unknown substratum: lagotis: 71% 35% sand; malitiosa: 94% sand,...