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 ...

Two new species of the Cybaeus hiroshimaensis-group (Araneae: Cybaeidae) from the northern Hida Mountains, Japan

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Two new species of the Cybaeus hiroshimaensis-group (Araneae: Cybaeidae) from the northern Hida Mountains, Japan

Abstract

Two small-sized species of the spider genus Cybaeus L. Koch, 1868, C. pycnothrix sp. nov. and C. tateyamensis sp. nov., are described based on both sexes from the Tateyama Mountain Range in the Hida Mountains, central Honshu, Japan. Phylogenetic analyses using nuclear internal transcribed spacer 1, 28S rRNA, and histone H3 markers revealed that the two new species are members of the monophyletic Japanese Cybaeus hiroshimaensis-group. Both new species conform to the morphological diagnosis of the hiroshimaensis-group — small body size and a short, thick male palp — and build two-opening retreats, indicating that retreat architecture in the group varies and encompasses both two- and three-opening forms.


Nakano, T., Ogawa, G., Mori, K., Hatanaka, Y., Koike, N., & Sugawara, Y. (2025). Two new species of the Cybaeus hiroshimaensis-group (Araneae: Cybaeidae) from the northern Hida Mountains, Japan. Soil Organisms, 97(3), 317–326. https://doi.org/10.25674/461