bioRxiv preprint doi: https://doi.org/10.1101/704692; this version posted July 16, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 1 Selection for imperfection: A review of asymmetric genitalia 2 in araneomorph spiders (Araneae: Araneomorphae). 3 4 5 6 F. ANDRES RIVERA-QUIROZ*1, 3, MENNO SCHILTHUIZEN2, 3, BOOPA 7 PETCHARAD4 and JEREMY A. MILLER1 8 1 Department Biodiversity Discovery group, Naturalis Biodiversity Center, 9 Darwinweg 2, 2333CR Leiden, The Netherlands 10 2 Endless Forms Group, Naturalis Biodiversity Center, Darwinweg 2, 2333CR Leiden, 11 The Netherlands 12 3 Institute for Biology Leiden (IBL), Leiden University, Sylviusweg 72, 2333BE 13 Leiden, The Netherlands. 14 4 Faculty of Science and Technology, Thammasat University, Rangsit, Pathum Thani, 15 12121 Thailand. 16 17 18 19 Running Title: Asymmetric genitalia in spiders 20 21 *Corresponding author 22 E-mail:
[email protected] (AR) 23 bioRxiv preprint doi: https://doi.org/10.1101/704692; this version posted July 16, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 24 Abstract 25 26 Bilateral asymmetry in the genitalia is a rare but widely dispersed phenomenon in the 27 animal tree of life. In arthropods, occurrences vary greatly from one group to another 28 and there seems to be no common explanation for all the independent origins.