Raphidascaris (Ichthyascaris) spinicauda n. sp., scanning electron micrographs. (A) Cephalic end of female, sublateral view (arrow indicates ventral connection of lateral alae); (B) cephalic end of female, apical view; (C) dorsal lip, dorsal view; (D) tail tip of female, lateral view (upper side is ventral) (arrow indicates lateral ala); (E) posterior end of male, ventrolateral view (arrow indicates phasmid); (F) tail tip of male, lateral view (upper side is ventral) (arrow indicates phasmid). (a) Double cephalic papilla; (c) cloaca; (d) dorsal lip; (p) postanal papillae; (pp) preanal papillae; (s) subventral lip.