The impact of Centruroides tecomanus scorpion venom on cardiac function in rats during early envenomation

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  The impact of Centruroides tecomanus scorpion venom on cardiac function in rats during early envenomation Abstract Scorpion envenomation is a medical emergency that can produce severe cardiovascular complications . Centruroides tecomanus , an endemic scorpion species from western Mexico, is medically relevant, although its early cardiac effects remain poorly characterized. This study evaluated the initial cardiotoxic effects of C. tecomanus venom in Wistar rats using serial electrocardiographic recordings, algorithm-based ECG signal processing, histopathology, and serum biochemical markers. Fourteen rats were allocated to control and venom-treated groups (n = 7 per group). The experimental group received an intraperitoneal sublethal dose equivalent to one-third of the LD 50 . One-minute ECG recordings obtained at 5-min intervals during the first hour were analyzed using an enhanced computational algorithm for noise reduction, R-peak detection, R–R interval analysis, and characte...

A new species of tiny arboreal tarantula of the genus Typhochlaena C. L. Koch, 1850 (Araneae, Theraphosidae) from the State of Bahia, Brazil

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A new species of tiny arboreal tarantula of the genus Typhochlaena C. L. Koch, 1850 (Araneae, Theraphosidae) from the State of Bahia, Brazil

Abstract

The genus Typhochlaena C. L. Koch, 1850 comprises five species of tiny arboreal theraphosids found exclusively in Brazil. Some species have a colored, eye-catching pattern which make them an object of desire to the pet market, and two species were included in the Red Book of Threatened Brazilian Fauna by the Brazilian government. Typhochlaena was recovered as the sister group of the remaining aviculariines in phylogenetic analyses, as the genus retains several plesiomorphies and represents a distinct and old divergent clade. Therefore, it is important to obtain information about their species concerning distribution, habits and biology to aid in protecting their populations and species. Herein, we describe Typhochlaena chapadensis sp. nov., from the Brazilian State of Bahia, in the Chapada Diamantina region. The new species is closely related with T. curumim Bertani, 2012 but can be distinguished by the shape of the male palpal bulb, color pattern and geographic distribution.

Bertani, R., Antunes, V.S. & Gallão, J.E. (2025) A new species of tiny arboreal tarantula of the genus Typhochlaena C. L. Koch, 1850 (Araneae, Theraphosidae) from the State of Bahia, Brazil. Zootaxa, 5660 (1), 102–110. https://doi.org/10.11646/zootaxa.5660.1.6