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...

Review of the American genus Bolostromus Ausserer, 1875 with the description of fourteen new species (Araneae, Cyrtaucheniidae)

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Review of the American genus Bolostromus Ausserer, 1875 with the description of fourteen new species (Araneae, Cyrtaucheniidae)

Abstract

The family Cyrtaucheniidae is seldom found in the Americas, only 10 species are known to occur. Herein we described fourteen new species for the family Cyrtaucheniidae, all belonging to the genus Bolostromus from Central America and South America: Bolostromus busu n. sp. (female); B. devriesi n. sp. (female); B. epiphyticus n. sp. (male, female); B. fonsecai n. sp. (male); B. hubeni n. sp. (male, female); B. italoi n. sp. (female); B. laheredia n. sp. (male); B. losrios n. sp. (male); B. nischki n. sp. (male); B. urku n. sp. (male), B. primus n. sp. (male); B. pristirana n. sp. (male); B. stridulator n. sp. (male), and B. valdivia n. sp. (female). Photographs of the type specimens of: Bolostromus fauna (male and female); Bolostromus gaujoni (male); B. holguinensis (female juvenile); B. insularis (female juvenile); B. pulchripes (female); B. riveti (male) and, B. venustus (female) are provided, as well as a distribution map of all species.

  • NADINE DUPÉRRÉMuseum of Nature Hamburg; Leibniz Institute for the Analysis of Biodiversity Change (LIB); Center for Taxonomy and Morphology; Martin-Luther-King-Platz 3; Hamburg; Germany Research Associate; American Museum of Natural History; New York; NY; U.S.A.https://orcid.org/0000-0003-2195-878X