Two new arthropod toxins purified from the venom of the Mexican scorpion Centruroides nigrescens

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  Two new arthropod toxins purified from the venom of the Mexican scorpion Centruroides nigrescens Abstract The venom of the slender black scorpion Centruroides nigrescens , from the State of Guerrero México, was fractionated by Sephadex G–50 gel filtration, followed by carboxymethyl cellulose ion separation and high–performance liquid chromatography, permitting to obtain two new peptides toxic to arthropods. The estimate LD 50 of the soluble venom for the insect Acheta domesticus was 11.1 μg/g body weight, and for the arthropod Armadillidium vulgare was 61.1 μg body weight . The amino acid sequence of toxin Cnige1 (toxic to A. domesticus and A. vulgare ) contains 65 amino acids, with a molecular mass of 7273.37 mass units, whereas toxin Cnige2, toxic to A. domesticus , contains 68 amino acids, with a molecular mass of 7548.81 units. Both peptides are well packed, containing 8 cysteines, which in the native venoms are forming 4 disulfide bridges each. The amino acid sequences f...

A new species of the mygalomorph genus Strophaeus Ausserer, 1875 (Araneae: Barychelidae) from Colombia

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A new species of the mygalomorph genus Strophaeus Ausserer, 1875 (Araneae: Barychelidae) from Colombia

Abstract

A new species of the poorly known mygalomorph genus Strophaeus Ausserer, 1875 is described. The new species, Strophaeus quillacinga sp. nov., is described from Nariño, Colombia. It represents the first record of Strophaeus from Colombia, with the genus previously only known from Peru, Brazil, and Panama. This species can be distinguished from other known female congeners by the presence of a higher number of spines on the rastellum and the abdomen dorsally mottled.

RÍOS-TAMAYO,D. (2023) A new species of the mygalomorph genus Strophaeus Ausserer, 1875 (Araneae: Barychelidae) from Colombia Arachnology 19 (6): 881–884