A comparison of adhesive performance among six cursorial spider species

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  A comparison of adhesive performance among six cursorial spider species Abstract The ability to adhere to surfaces is particularly relevant for cursorial predatory arthropods like hunting spiders, which often traverse relatively complex environments characterized by large variation in substrate properties. Here, we evaluated the adhesive performance of six hunting spider species that are common in eastern temperate North America and lack specialized tarsi for climbing smooth or inclined surfaces [Lycosidae: Pardosa lapidicina Emerton, 1885 and Rabidosa rabida (Walckenaer, 1837); Oxyopidae: Oxyopes salticus Hentz, 1845; Pisauridae: Pisaurina mira (Walckenaer, 1837); Dolomedidae: Dolomedes triton (Walckenaer, 1837), and Dolomedes scriptus Hentz, 1845]. We tested adhesion performance as shear load resistance (g) on a glass plate, and as the angle of failure (°) when the plate was gradually inclined relative to horizontal. Average angle of failure and shear resistance differed among ...

Revising the revision: on 12 new species of Stethorrhagus Simon, 1896 from Colombia and Ecuador (Araneae: Corinnidae: Corinninae), with reassessments of all previously described species

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Revising the revision: on 12 new species of Stethorrhagus Simon, 1896 from Colombia and Ecuador (Araneae: Corinnidae: Corinninae), with reassessments of all previously described species

Abstract

Twelve new species of the genus Stethorrhagus Simon, 1896 are described: S. bradypus sp. nov. (♂♀), S. callithrix sp. nov. (♂♀), S. loxodonta sp. nov. (♂♀), S. naja sp. nov. (♂♀), S. papilio sp. nov. (♀) and S. sylvilagus sp. nov. (♂♀) from Colombia; S. canis sp. nov. (♀), S. felis sp. nov. (♂♀), S. mandrillus sp. nov. (♂♀), S. ovis sp. nov. (♂♀), S. sciurus sp. nov. (♀) and S. tremarctos sp. nov. (♂♀) from Ecuador, increasing the number of known species in the genus from 15 to 27. Detailed morphological descriptions, photos of the body and copulatory organs, illustrations of copulatory organs, and comparisons with closely related species are given for all new species, along with emended diagnoses, distribution maps and an updated key to all currently accepted species in the genus. The geographical distribution of S. lupulus and S. oxossi are updated with new records from Brazil and Peru, and Brazil, respectively. Additionally, photographs of the type material of S. limbatus Simon, 1896, S. nigrinus (Berland, 1913), S. maculatus (L. Koch, 1866), S. hyula Bonaldo & Brescovit, 1994, S. planada Bonaldo & Brescovit, 1994, S. duidae Gertsch, 1942, S. roraimae Gertsch, 1942, S. peckorum Bonaldo & Brescovit, 1994, and S. archangelus Bonaldo & Brescovit, 1994 are supplied.

Xavier, C., Brescovit, A. D., & Bonaldo, A. B. (2025). Revising the revision: on 12 new species of Stethorrhagus Simon, 1896 from Colombia and Ecuador (Araneae: Corinnidae: Corinninae), with reassessments of all previously described species. European Journal of Taxonomy, 1013(1), 1–76. https://doi.org/10.5852/ejt.2025.1013.3057