The chromosome-level genome of Mesobuthus martensii provides insights into its evolution and the diversity of venom peptides

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  The chromosome-level genome of Mesobuthus martensii provides insights into its evolution and the diversity of venom peptides Abstract Mesobuthus martensii , the source species of the traditional Chinese medicine “Quanxie”, has long been utilized for its therapeutic properties. Venom peptides are recognized as the major active molecular basis of these pharmacological activities. Despite this, their development as therapeutic agents remains poorly explored. In this study, we performed an integrated multi-omics investigation to systematically explore the venom peptides of Mesobuthus martensii . We generated a chromosome-level genome assembly of Mesobuthus martensii using third-generation sequencing technologies, yielding a genome size of 1.08 Gb with a contig N50 of 46.46 Mb. Integrated genomic and transcriptomic analyses led to the identification of 51 putative novel venom peptide candidates. From the broader venom peptide set, five lysine- and arginine-rich candidates were select...

Two fancy spines and a collar: a taxonomic review of the myrmecomorphic spider genus Mazax O. Pickard-Cambridge, 1898 (Araneae: Corinnidae: Castianeirinae) in South America

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Two fancy spines and a collar: a taxonomic review of the myrmecomorphic spider genus Mazax O. Pickard-Cambridge, 1898 (Araneae: Corinnidae: Castianeirinae) in South America

Abstract

The South American species of the myrmecomorphic spider genus Mazax O. Pickard-Cambridge, 1898 (Castianeirinae, Corinnidae) are revised for the first time, increasing the number of known species from South America from two to six and the number of species in the genus from seven to 11. Here, we reevaluate the identity of Apochinomma acanthaspis Simon, 1896, propose its transfer to Mazax, and consider M. akephaloi Perger & Pett, 2022 as a junior synonym of M. acanthaspis comb. nov. Additional documentation of M. ramirezi Rubio & Danişman, 2014 is provided. The species M. pax Reiskind, 1969 and M. spinosa (Simon, 1898) are recorded from South America for the first time. Three new species are proposed, all based on both sexes: Mazax mokana sp. nov. and M. leonidas sp. nov. from Colombia, and M. tembe sp. nov. from Brazil. Emended diagnoses of the genus and of all six known South American species, as well as a key to males and females for all 11 species in the genus, are provided.

Silva-Junior, Cláudio J., Leonel Martínez, Eduardo Villarreal, and Alexandre B. Bonaldo. 2024. “Two Fancy Spines and a Collar: A Taxonomic Review of the Myrmecomorphic Spider Genus Mazax O. Pickard-Cambridge, 1898 (Araneae: Corinnidae: Castianeirinae) in South America”. European Journal of Taxonomy 968 (1):219-55. https://doi.org/10.5852/ejt.2024.968.2731.