The neonicotinoid imidacloprid impairs the predatory performance and functional response of the jumping spider Helpis minitabunda (Araneae, Salticidae)

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  The neonicotinoid imidacloprid impairs the predatory performance and functional response of the jumping spider Helpis minitabunda (Araneae, Salticidae) Abstract The neonicotinoid imidacloprid can cause lethal and sublethal effects in non-target organisms, including impaired behavior, reduced fertility, disrupted locomotion, and reduced predatory performance in arthropods. Spiders are among the most abundant arthropod predators in terrestrial ecosystems, including agricultural ecosystems, yet the effects of neonicotinoids on the predatory function of jumping spiders remain poorly understood. The functional response of a predator describes how predation rates change with prey density and is key to understanding predator–prey dynamics. We tested whether acute exposure to a commercial formulation of imidacloprid at field-recommended concentrations alters the functional response of the Aussie bronze jumping spider, Helpis minitabunda (L. Koch, 1880). We compared the predation of treat...

A revision of Afrotropical Asceua (Araneae, Zodariidae), ant-eating spiders with puzzling distributions

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A revision of Afrotropical Asceua (Araneae, Zodariidae), ant-eating spiders with puzzling distributions

Abstract

The Afrotropical representatives of the zodariid spider genus Asceua Thorell, 1889 are revised. Apart from the known species A. radiosa Jocqué, 1986 (Comoros, Mayotte) and A. lejeunei Jocqué, 1991 (DR Congo, Ethiopia, Ghana, Guinea, Ivory Coast, Nigeria), six new species are recognized and described: A. arborivaga sp. nov. (♀, Guinea), A. foordi sp. nov., (♂♀, DR Congo, Guinea, South Africa), A. incensa sp. nov. (♂♀, DR Congo), A. luki sp. nov. (♂♀, DR Congo), A. palustris sp. nov. (♀, DR Congo) and A. ventrofigurata sp. nov. (♂♀, Tanzania). A key to the species is provided. Some of the species have a very large distribution, which is unusual in the Zodariidae. The phenomenon is probably linked to the canopy dwelling behaviour, which appears common in the genus but unique for this spider family.

Jocqué R, Henrard A (2024) A revision of Afrotropical Asceua (Araneae, Zodariidae), ant-eating spiders with puzzling distributions. African Invertebrates 65(2): 161-198. https://doi.org/10.3897/afrinvertebr.65.138029