title: Re-description of Xysticus bimaculatus L. Koch, 1867 (Araneae, Thomisidae) and characterization of its subsocial lifestyle.
abstract: Spiders have become an important model to study the evolution of sociality, but a lack of their detailed natural history and taxonomy hinders broader comparative studies. Group-living crab spiders (Thomisidae) provide an excellent contrast to other social spiders since they lack a communal capture web, which was thought to be a critical factor in the evolution of sociality. Only three non-webbuilding crab-spider species are known to be subsocial or social, all of which belong to the genus Diaea Thorell, 1869. The aim of this study is to describe the social lifestyle of Xysticus bimaculatus L. Koch, 1867 for the first time. Furthermore, we present a detailed re-description of this species and discuss its taxonomic implications. Like other subsocial crab spiders, X. bimaculatus builds nests from tree leaves. Nests contain up to 38 spiders and sometimes several adult females, indicating the species may be at a transitory stage between subsociality and permanent sociality.
authors.affiliation: Department of Biological Sciences, Macquarie University, North Ryde, NSW 2109, Australia ; Zoological Institute and Zoological Museum, Biocenter Grindel, University of Hamburg, Martin-Luther-King- Platz 3, 20146 Hamburg, Germany.
authors.forename: Jasmin
authors.initials: J
authors.lastname: Ruch
authors.affiliation: Zoological Institute and Zoological Museum, Biocenter Grindel, University of Hamburg, Martin-Luther-King- Platz 3, 20146 Hamburg, Germany.
authors.forename: Torben
authors.initials: T
authors.lastname: Riehl
authors.affiliation: Zoological Institute and Museum, Ernst-Moritz-Arndt-University, J.-S.-Bach-Str. 11/12, 17489 Greifswald, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Michalik
keywords: Social spider; cooperation; female care; micro-CT; palp; taxonomy