title: The development of the ventral papillae of Notocotylus triserialis (Digenea: Notocotylidae).
abstract: The development of the ventral papillae of Notocotylus triserialis was studied by light and electron microscopy. The median row papillae first appeared on 2-day-old worms and the lateral rows on 4-day-old worms. The papillae grew in size and in number and size of constituent cells, with rapid development occurring between days 5 and 8. This rapid growth corresponded with the time of onset of egg production by the worm. Electron microscopy indicated that the papillae of 3- and 4-day-old worms contained numerous undifferentiated cells with little cytoplasm and extensive Golgi bodies. By days 5 and 6 most of these cells contained developing mitochondria; only a few undifferentiated cells were visible. Muscles and nervous tissue also became more prominent at this time. The ultrastructure of the papillae of 7- and 8-day-old worms was similar to that of papillae from adult worms. After day 9 or 10, the size and number of cells per papilla remained constant until the death of the worm.
mesh_terms: D000818:Animals; D002432:Cecum / Q000469:parasitology*; D002645:Chickens / Q000469:parasitology*; D003593:Cytoplasm / Q000648:ultrastructure; D006056:Golgi Apparatus / Q000648:ultrastructure; D008854:Microscopy, Electron; D008928:Mitochondria / Q000648:ultrastructure; D014200:Trematoda / Q000254:growth & development* / Q000648:ultrastructure