Ultrastructural studies on the sporocyst wall of Diplostomum pseudospathaceum Niewiadomska, 1984 (Digenea, Diplostomidae).
The sporocyst wall of the daughter sporocyst of Diplostomum pseudospathaceum is composed of many elements. It is covered by a syncytial layer of cytoplasm connected to sunken nucleated perikarya (cytons), lying underneath the outer-circular and the inner longitudinal muscle layers. The outer tegumental part forms numerous microvilli covered by glycocalyx and contains many microfilaments, single ribosomes, electron-dense granules and short electron-lucid cisternae. No other cell organelles were seen in this layer. The cytons include all the organelles needed for cell metabolism. The sporocyst wall also contains the sarcoplasmic parts of the muscle cells; large vacuolar cells filled with electron-transparent vacuoles; macrophagic cells containing numerous phagosomes and sending extensions separating the sporocyst wall from the brood chamber; flame cells and reproductive cells. Nerve fibres, filled with neurosecretory granules, are seen among the sporocyst wall cells. The uniciliate sensory receptors are inserted in the outer tegumental part.
Klag
J
J
Jagiellonian University, Institute of Zoology, Kraków, Poland. klag@zuk.iz.uj.edu.pl
Niewiadomska
K
K
Czubaj
A
A
D000818:Animals; D008264:Macrophages / Q000648:ultrastructure; D008871:Microvilli / Q000648:ultrastructure; D009132:Muscles / Q000648:ultrastructure; D009420:Nervous System / Q000648:ultrastructure; D015388:Organelles / Q000648:ultrastructure; D014200:Trematoda / Q000648:ultrastructure*