The distribution, spatial clustering, and density of trapdoor spiders in two California coastal dune ecosystems

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  The distribution, spatial clustering, and density of trapdoor spiders in two California coastal dune ecosystems Abstract Coastal dune ecosystems support endemic trapdoor spiders, yet population data for these species are limited. We conducted the first coastal dune trapdoor spider population estimation surveys at Moss Landing State Beach (California) and for Aptostichus stephencolberti Bond 2008 at Sunset State Beach using randomly selected 1m 2 quadrats across ~26,000 m 2 per site. Burrow densities were similar between sites (Sunset: 0.287 burrows/m 2 ; Moss: 0.453 burrows/m 2 ), yielding estimated population sizes of ~35,206 and ~30,959 individuals, respectively. However, spatial analyses revealed contrasting patterns of burrow distribution. At Sunset State Beach, burrow presence was strongly associated with vegetation and occurred closer to plants, despite vegetation being randomly distributed. In contrast, no vegetation–burrow association was detected at Moss Landing, alth...

New distributional data for the spiders Cheiracanthium inclusum (Hentz, 1847) (Araneae: Cheiracanthiidae) and Zimiris doriae Simon, 1882 (Araneae: Prodidomidae) in Mexico

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New distributional data for the spiders Cheiracanthium inclusum (Hentz, 1847) (Araneae: Cheiracanthiidae) and Zimiris doriae Simon, 1882 (Araneae: Prodidomidae) in Mexico

Among the 2345 species, 455 genera, and 70 families of spiders recorded from Mexico (Ponce-Saavedra et al. 2023), some have few documented records within the country, even when such species have broad distributions spanning multiple countries, entire continents, or even multiple continents. This is particularly true for some introduced species, such as Cheiracanthium inclusum (Hentz, 1847) (Cheiracanthiidae), currently known from North and South America, including the Caribbean, and introduced to Réunion Island (Ledoux 2004, World Spider Catalog 2026). Cheiracanthium inclusum has been recorded from eight Mexican states (Gómez-Moreno et al. 2023); however, its distribution within the country may be more extensive, given its known broad distribution across the Americas. Zimiris doriae Simon, 1882 (Prodidomidae), is known from Africa and Asia but has been introduced to Europe, North America, and South America (World Spider Catalog 2026). In Mexico, Z. doriae is known from three Mexican states (Gómez-Moreno et al. 2023), confirming that this species is not only introduced but has likely become established in the country. Herein, we provide new distributional data for C. inclusum and Z. doriae that extend the known distribution of both species in Mexico. Both species had been previously identified by our team in other regions of Mexico (e.g., Gómez-Moreno et al. 2023, Jiménez et al. 2024), which facilitated the identification of the new specimens.

David Chamé-Vázquez, Eduardo Rafael Chamé-Vázquez, Mateo Rubio-Santana "New distributional data for the spiders Cheiracanthium inclusum (Hentz, 1847) (Araneae: Cheiracanthiidae) and Zimiris doriae Simon, 1882 (Araneae: Prodidomidae) in Mexico," The Pan-Pacific Entomologist, 102(3), 191-194, (30 September 2026)