Ascarophis (Ascarophis) nasonis Machida, 1981 from Naso spp., scanning electron micrographs. (A) Tail of male, sublateral view (arrows indicate postanal papillae); (B) precloacal region of male, ventrolateral view (arrows indicate preanal papillae); (C) region of cloaca, subventral view; (D) posterior part of male tail, ventral view (arrows indicate postanal papillae); (E) anterior end of body, lateral view; (F) tail of female, lateral view; (G) posterior end of female tail, lateral view. (c) Cloacal aperture; (d) median depression on posterior cloacal lip; (e) papillae of first postanal pair; (f) deirid; (g) anus; (h) phasmid.