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...

Two new species of the open-holed trapdoor spider genus Proshermacha (Araneae: Mygalomorphae: Anamidae) from southern Western Australia

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Two new species of the open-holed trapdoor spider genus Proshermacha (Araneae: Mygalomorphae: Anamidae) from southern Western Australia

Abstract
The open-holed trapdoor spider genus Proshermacha Simon, 1908 is endemic to southern Australia, and currently contains 11 named species. We describe two new species from south-western Australia: Proshermacha telaporta sp. nov. from the Geraldton Sandplains and Swan Coastal Plain bioregions, and Proshermacha robertblosfeldsi sp. nov. from the Warren bioregion.

Harvey MS, Wilson JD & Rix MG (2023). Two new species of the open-holed trapdoor spider genus Proshermacha (Araneae: Mygalomorphae: Anamidae) from southern Western Australia. Australian Journal of Taxonomy 43: 1–13. doi: https://doi.org/10.54102/ajt.2k58g