Requested reference
Gunnarsson, B., Uhl, G. & Wallin, K. (2004). Variable female mating positions and offspring sex ratio in the spider Pityohyphantes phrygianus (Araneae: Linyphiidae). Journal of Insect Behavior 17(1): 129-144. doi:10.1023/B:JOIR.0000025137.59613.71 -- Show included taxa