Fig. 1
From: Nematodes
Diagrammatic representation of the posterior ends of different nematode genera (a–e) and the copulatory system in trichostrongylids (f). A anus, AL ala, B bursa copulatrix, G gubernaculum, K copulatory appendix, P papilla, PH phasmids, S sucker-like structure, SP spiculum, SS sheath of SP, ST fortifying rays