FIGURE 4 in Comparison of the cryptic nematode species Caenorhabditis brenneri sp. n. and C. remanei (Nematoda: Rhabditidae) with the stem species pattern of the Caenorhabditis Elegans group

FIGURE 4. Aspects of male copulatory structures in C. brenneri sp. n. (A–D) and C. remanei (E–G). A and E: bursa in ventral view showing precloacal hook, distal part of gubernaculum and genital papillae (GP). In A the GPs are numbered (v = ventral GPs, ad = anterior dorsal GP, pd = posterior dorsal GP slightly out of focus). The differences in size and shape of the bursa in A and E are individual differences and do not mark differences between the species. B: male tail in lateral view. Arrow points to precloacal hook, arrowhead points to distal part of gubernaculum which is bent dorsally in living animals. C and F: cloacal region with precloacal hook and distal part of gubernaculum in situ. D and G: isolated gubernaculum in ventral view and spicules (G). Note that the two lateral processes (ears) are larger and more strongly refractive in C. brenneri sp. n. than in C. remanei. Scale is the same in Figs. A, B, E; and in Figs. C, D, F, G, respectively.