Parapharyngodon ayotzinapaensis sp. n. SEM microphotographs. A Male, ventral view of posterior end B Male, ventral view of posterior end showing cloacal lip and papillae (1-5 outgrowths ornamentation disposition) C Male, posterior end of post cloacal lip showing right papillae D Male, oral opening E Male, pair of papillae at caudal filament F Female, ventral view of posterior end G Female, oral opening H Egg. Scale bars = (A) 0.025 mm, (B) 0.04 mm, (C, D, E, F, G) 0.01 mm, (H) 0.02 mm.