Fig. 18 in Eleven new South African earthworms (Oligochaeta: Microchaetidae) with new information on some known species, and an inventory of the microchaetids of KwaZulu-Natal

Fig. 18. Tritogenia tetrata sp. n., holotype, anterior part of the body ventrally, showing secondary annulation of segments 4–10, tubercula pubertatis, and papillae.