Fig. 2
From: Functional morphology of immature mating in a widow spider
Virtual sagittal sections (Micro-CT Images) through the genital region of L. geometricus females in different developmental stages and of different mating status. Lateral view. Anterior is at the top, posterior is at the bottom. a: Virgin late-subadult female. Arrow indicates cuticle covering the genital atrium. b: Mated late-subadult female. Arrows indicate ripped open cuticle. c: Mated adult female. at, genital atrium; cd, copulatory duct; spa, anterior spermathecal lobe; spp., posterior spermathecal lobe