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...

An updated and annotated checklist of the spiders (Arachnida: Araneae) of Iraq

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An updated and annotated checklist of the spiders (Arachnida: Araneae) of Iraq

Abstract


An updated and annotated checklist of the spiders of Iraq, currently comprising 104 species in 75 genera and 29 families is presented, including six endemic and four subendemic species. Twenty-three records are considered misidentifications and therefore omitted from the checklist. Where possible, the misidentified records are attributed to other species based on their distribution and morphology; as a result of this, three species are recorded in Iraq for the first time: Dictis striatipes L. Koch, 1872 (Scytodidae), Hippasa deserticola Simon, 1889 (Lycosidae) and Latrodectus cinctus Blackwall, 1865 (Theridiidae). The history of studies and the geographical distribution of records are reviewed and discussed. The list is dominated by members of the families Gnaphosidae, Lycosidae, and Salticidae, comprising 15.4%, 13.5% and 10.6% of the total number of species, respectively.


Al-Khazali, Azhar & Kachel, Hamid & Zamani, Alireza & Hussen, Fenik. (2023). An updated and annotated checklist of the spiders (Arachnida: Araneae) of Iraq. Zootaxa. 5339. 132-158. 10.11646/zootaxa.5339.2.2.