Advancing the systematics of Araneae: ultraconserved elements phylogenomics demonstrates the non-monophyly of Miturgidae Simon, 1886 and supports the Familial Rank of Systariidae Deeleman-Reinhold, 2001

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  Advancing the systematics of Araneae: ultraconserved elements phylogenomics demonstrates the non-monophyly of Miturgidae Simon, 1886 and supports the Familial Rank of Systariidae Deeleman-Reinhold, 2001 Abstract The systematic status of the family Miturgidae Simon, 1886 and related subfamilies has long been problematic, primarily due to challenges in interpreting morphological characters and limited molecular sampling. In this study, we reconstruct the phylogeny of Miturgidae using ultraconserved elements and estimate its divergence time. Our results suggest that Systariinae does not belong to Miturgidae, but rather is sister to all other families of the Dionycha B clade. Consequently, we elevate it to family rank as Systariidae Deeleman-Reinhold, 2001 and discuss its morphological synapomorphies. Furthermore, our analyses place Miturgidae as the sister clade to Viridasiidae + Selenopidae under multiple phylogenetic methods. Divergence time estimates indicate an ancient origin of...

Spiders (Arachnida: Araneae) from the Sky Island Mountains of Sonora: A survey at Rancho Las Playitas, Arizpe and Bacoachi with new species records for Mexico

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Spiders (Arachnida: Araneae) from the Sky Island Mountains of Sonora: A survey at Rancho Las Playitas, Arizpe and Bacoachi with new species records for Mexico

Abstract

This study investigates the diversity, abundance, and composition spider communities in Rancho Las Playitas, Arizpe and Bacoachi, Sonora, Mexico. Moreover, we present a comprehensive species list for the Sky Island Mountains of Sonora, compiled from recent surveys. Spiders were collected using three methods: visual searching, foliage beating, and pitfall trapping. We report 29 new distributional records for spider species, four of which are new country records for Mexico and 25 for the state of Sonora. Additionally, we describe and image the vulva of Calilena arizonica Chamberlin & Ivie, 1941 for the first time, and provide images of 28 additional species. Our findings expand the known spider diversity in the region and reveal richness and compositional pattern in Rancho Las Playitas that exhibit low similarity to other spider communities from arid environments.

Estudiamos la diversidad, abundancia y composición de una comunidad de arañas en Rancho Las Playitas, Arizpe y Bacoachi, Sonora México. Además, se compiló una lista de arañas de las Islas Serranas (Archipiélago Madrense) de Sonora con base en colectas recientes. Las arañas se colectaron mediante tres métodos: búsqueda visual, golpeo en la vegetación y trampas de caída. Además, proporcionamos nuevos datos de distribución de 29 especies de arañas, de las cuales cuatro especies se registran por primera vez para México y 25 para el estado de Sonora. Adicionalmente, describimos e ilustramos la vulva de Calilena arizonica Chamberlin & Ivie, 1941 y proveemos imágenes de 28 especies adicionales. Nuestros resultados son una contribución al conocimiento de la diversidad de arañas en esta región y demuestra que los patrones de riqueza y composición en Las Playitas presentan una baja similitud en comparación con otras comunidades de las zonas áridas.

María-Luisa Jiménez, David Chamé-Vázquez, Carlos Palacios-Cardiel, Thomas R. Van Devender "Spiders (Arachnida: Araneae) from the Sky Island Mountains of Sonora: A survey at Rancho Las Playitas, Arizpe and Bacoachi with new species records for Mexico," The Pan-Pacific Entomologist, 100(3), 175-211, (4 October 2024) https://doi.org/10.3956/2024-100.3.175