Fig. 6
From: Functional morphology of immature mating in a widow spider
Serial cross sections of the genitalia of virgin L. geometricus females in different developmental stages starting from the anterior. Dorsal is at the top, ventral is at the bottom. a-c: Spermathecae and copulatory ducts of a late subadult female that are both filled with a light blue secretion. d-f: Spermathecae and copulatory ducts of an adult female that are both filled with a bright blue secretion. Scale bars = 100 μm. cd, copulatory duct; cf., common fertilization duct; mf, muscle fibers; se, secretion; sp., spermatheca; ue, uterus externus