Abstract
Ultrastructural studies were conducted on the ventral papillae of the notocotylid trematodeQuinqueserialis quinqueserialis (Barker and Laughlin, 1911). Each papilla is covered by a thin syntegument, highly convoluted in the apical region but becoming spinose marginally. Bulbous and ciliated sensory receptors, the latter possessing a cilium with a 9+9 microtubule arrangement, occur infrequently in the apical syntegument. Large pyriform cells, forming the bulk of each papilla, underlie the syntegument but are connected to it by tight junctions. Pyriform cells contain numerous elongate mitochondria with extensive cristae but lack secretory organelles. Osmoregulatory ducts extend into each papilla and are joined to pyriform cells by tight junctions. These observations suggest that papillae are nonglandular and may function in nutrient absorption.
Published Version
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