Surface ultrastructure of Pygidiopsis summa (Digenea: Heterophyidae) adult flukes
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A scanning electron microscopic study was performed on the surfaceultrastructure of Pygidiopsis summa (Digenea: Heterophyidae) adults. Metacercariae werecollected from gills and muscles of mullets ( Mugil cephalus ) caught in a known endemicarea, and adult flukes were harvested from dogs after 8 weeks of experimental infection.The worm was calabash form with its posterior part broader than the anterior part.Tegumental spines were densely distributed over the body surface, except on the suckersand genital apparatus, and around the excretory pore. Well differentiated spines wereobserved on the anterior half of the body, with 14-16 tips ventrally, and 19-20 tipsdorsally. On the oral sucker, three pairs of type I sensory papillae (uni-ciliated knob-likeswellings) and one pair of type II sensory papillae (aciliated round-swellings) were observedon the anterior and posterior parts of the lip, respectively. On the lip of the ventral sucker,one pair of type II sensory papillae was distributed only on its posterior part. Sperms wereseen emerging from or entering into the genital apparatus. The results showed that thesurface ultrastructure of P. summa was unique among the heterophyid trematodes,especially in digitation of tegumental spines and in distribution of sensory papillae on oraland ventral suckers.
Abstract
A scanning electron microscopic study was performed on the surfaceultrastructure of Pygidiopsis summa (Digenea: Heterophyidae) adults. Metacercariae werecollected from gills and muscles of mullets ( Mugil cephalus ) caught in a known endemicarea, and adult flukes were harvested from dogs after 8 weeks of experimental infection.The worm was calabash form with its posterior part broader than the anterior part.Tegumental spines were densely distributed over the body surface, except on the suckersand genital apparatus, and around the excretory pore. Well differentiated spines wereobserved on the anterior half of the body, with 14-16 tips ventrally, and 19-20 tipsdorsally. On the oral sucker, three pairs of type I sensory papillae (uni-ciliated knob-likeswellings) and one pair of type II sensory papillae (aciliated round-swellings) were observedon the anterior and posterior parts of the lip, respectively. On the lip of the ventral sucker,one pair of type II sensory papillae was distributed only on its posterior part. Sperms wereseen emerging from or entering into the genital apparatus. The results showed that thesurface ultrastructure of P. summa was unique among the heterophyid trematodes,especially in digitation of tegumental spines and in distribution of sensory papillae on oraland ventral suckers.