A new species of the genus Spinoctenus Hazzi, Polotow, Brescovit, González-Obando et Simó, 2018 (Araneae: Ctenidae) from Panama

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  A new species of the genus Spinoctenus Hazzi, Polotow, Brescovit, González-Obando et Simó, 2018 (Araneae: Ctenidae) from Panama A new species Spinoctenus leleji sp. n . is described from Panama based on a male specimen. This is the first record of the genus Spinoctenus from Panama and the second record of this genus outside South America. The new species is most similar to S. tequendama Hazzi, Polotow, Brecovit, González-Obando et Simó, 2018, but differs by the structure of the male palp and the shape of metatarsus IV. Photographs of the habitus and copulatory organs are provided. The type locality of the new species is mapped. Omelko, Мichail M. 2026. A new species of the genus Spinoctenus Hazzi, Polotow, Brescovit, González-Obando et Simó, 2018 (Araneae: Ctenidae) from Panama. Far Eastern Entomologist(554): 19-24.  https://biosoil.ru/fee/publication/2988

A revised classification system of the marronoid clade of spiders (Araneae), based on dense sampling phylogenomics and comparative morphology

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A revised classification system of the marronoid clade of spiders (Araneae), based on dense sampling phylogenomics and comparative morphology

Abstract

The marronoid clade is a globally distributed, ecologically diverse group of spiders. It is an important faunal component in both natural and synanthropic environments, and even found in aquatic and extreme habitats such as desert salt flats. The systematics of the marronoid clade has been notoriously unstable due to the widespread character homoplasy and phenotypic variation found across the group, resulting in vague family concepts. The present work aims to mitigate this problem by conducting the thus far most densely sampled phylogenetic study (including 58% of all known genera), combining genomic subsampling (ultraconserved elements) and marker sequencing approaches. Our study especially focused on the so-called Austral marronoids, which have not been sufficiently treated in recent revisionary works. Our results find robust evidence for a biogeographic separation of most marronoid families, which generally exhibit their highest diversity in temperate regions of both hemispheres and are poorly represented in the tropics. Based on our phylogenetic and comparative morphological study, we propose a revised classification system of the marronoid clade, comprising 18 families. We provide descriptions of each family, notes on their natural history and explain the gaps that persist in biodiversity documentation, delivering a robust foundation for future ecological, macro-evolutionary and taxonomic works.

Wolff, J. O., J. Kelly, M. B., Cala-Riquelme, F., Gorneau, J. A., Montana, K. O., Smith, H. M., Sirvid, P. J., Vink, C. J., Esposito, L. A., Ramírez, M. J., & Griswold, C. E. A revised classification system of the marronoid clade of spiders (Araneae), based on dense sampling phylogenomics and comparative morphology. Cladistics. https://doi.org/10.1111/cla.70057