On fork-tailed crab spiders: Two new species of Sidymella Strand, 1942 (Araneae: Thomisidae) from Ecuador

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  On fork-tailed crab spiders: Two new species of Sidymella Strand, 1942 (Araneae: Thomisidae) from Ecuador Abstract Two new species from the family Thomisidae are described from Ecuador: Sidymella ayahuma sp. nov. from the Andean chocó region in Northwestern Ecuador (♀) and Sidymella malefica sp. nov. (♀) from the Andes region in central Ecuador. Díaz-Guevara, D.R. & Machado, M. (2026) On fork-tailed crab spiders: Two new species of Sidymella Strand, 1942 (Araneae: Thomisidae) from Ecuador. Zootaxa, 5831 (2), 288–294. https://doi.org/10.11646/zootaxa.5831.2.11

A Comprehensive Pathophysiologic, Histologic, and Biochemical Analysis of Buthus paris (C. L. Koch, 1839) Venom

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A Comprehensive Pathophysiologic, Histologic, and Biochemical Analysis of Buthus paris (C. L. Koch, 1839) Venom

Abstract

Introduction

Buthus species, including B paris, are classified as one of the most dangerous scorpion genera in Morocco, implicated in several cases of human death. Our objective is to characterize, for the first time, the toxicity and histopathologic and biochemical impacts of B paris venom.

Methods

We investigated the experimental pathophysiology of B paris venom by examining histologic changes in vital organs (heart, kidneys, liver, and lungs) and assessing biochemical enzymatic markers (alanine aminotransferase, aspartate aminotransferase, lactate dehydrogenase, creatine phosphokinase, urea, and creatinine) in mice injected subcutaneously with 2 doses of 400 and 450 mg·kg–1.

Results

Our results showed that the subcutaneous median lethal dose of B paris venom was around 0.52 mg·kg–1. Histologic findings revealed significant tissue damage in the previously mentioned vital organs, confirmed through biochemical analysis indicating impaired heart and liver functions. Additionally, an increase in urea, creatinine, and glucose levels occurred following B paris venom injection.

Conclusion

Our findings show that B paris venom exhibits a high level of experimental toxicity. These results highlight the potentially lethal nature of this venom and emphasize the potential medical importance of this species.

Elmourid A, Elhidan MA, Boussaa S, et al. A Comprehensive Pathophysiologic, Histologic, and Biochemical Analysis of Buthus paris (C. L. Koch, 1839) Venom. Wilderness & Environmental Medicine. 2024;0(0). doi:10.1177/10806032241249748