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 Hadruroides Pocock, 1893 from Peru (Scorpiones: Caraboctonidae)

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A new species of Hadruroides Pocock, 1893 from Peru (Scorpiones: Caraboctonidae)

Abstract

A new species belonging to the genus Hadruroides Pocock, 1893 (family Caraboctonidae Kraepelin, 1905) is described on the basis of specimens collected in Apurimac region in Southern Peru. H. (Lourencoides) apu sp. n. appears to be related to H. (L.) mauryi Francke & Soleglad, 1980 and H. (L.) bustamantei Ochoa & Chaparro, 2008 but can be distinguished notably by a smaller size, different pigmentation pattern, reduced granulation, lower pectinal tooth count, metasoma with only the first segment wider than long and pedipalp chela slenderer in male and broader in female with fixed finger straight without proximal gap between fingers in both sexes. This new taxon represents the 18th known species of the genus Hadruroides reported from Peru and the 23rd species of the subgenus Lourencoides Rossi, 2014. The total number of Hadruroides species is now raised to 25.

Eric Ythier, Wilson R. Lourenço. A new species of Hadruroides Pocock, 1893 from Peru (Scorpiones: Caraboctonidae). Faunitaxys, 2023, 11 (76), pp.1-7. ⟨10.57800/faunitaxys-11(76)⟩. ⟨hal-04299577⟩