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...

Three New Wolf Spiders with Danni Sherwood (New Species Podcast)

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Three New Wolf Spiders with Danni Sherwood (New Species Podcast)


The island of Saint Helena can’t be described without the word special. It’s a small territory in the South Atlantic that is home to some of the most unique biodiversity in the world, including some extremely rare cloud forest spiders. An island full of spiders might not sound exciting for some, but to Danniella Sherwood it’s a dream! Listen in as Danni tells us all about the island and its history, the wolf spiders that find their home there, and the amazing community that supported and guided her work.

Danni Sherwood’s paper “Saint Helenian wolf spiders, with the description of two new genera and three new species (Araneae: Lycosidae)” is in volume 19 issue 5 of Arachnology.

It can be found here: https://doi.org/10.13156/arac.2023.19.5.816