Female and male cloaca of Nimba toads and a pair in amplexus. The female cloaca (top left) is close to the urostyle, whereas the male cloaca (top right) is ventrally oriented. During mating it swells and encloses the female cloaca. During the amplexus lumbalis the female is constantly horizontally swaying (bottom).

  Part of: Sandberger-Loua L, Müller H, Rödel M-O (2017) A review of the reproductive biology of the only known matrotrophic viviparous anuran, the West African Nimba toad, Nimbaphrynoides occidentalis. Zoosystematics and Evolution 93(1): 105-133. https://doi.org/10.3897/zse.93.10489