Fine structural studies on the intestinal trematode, Gyliauchen volubilis Nagaty 1956 from fish Siganus luridus in the Red Sea, Egypt.
For the fine structure of Gyliauchen volubilis, sections of the finger-like projections showed the structure of a segmented body, which is not attached with the outer membrane of the tegument. Each projection consists of one to four segments, the smallest segment is triangular in shape and located on the top of the projection, enveloped by a triple layered membrane, with electron dense structures in the cytoplasm. Two types of vesicles are scattered in the tegumental matrix; vesicle with electron dense body, and multigranulated vesicle. Spherical fragment also contains electron dense structures and starts as a round projection of the tegument that detaches itself from the rest of the tegument. The presence of these fragments could be evidence of exocytosis for this trematoda. A layer of vacuoles measuring 1 to 1.5 microm long and 0.5 to 0.8 microm wide, are located beneath the matrix of the tegument which could be the douse of release product. For some areas of trematode, larger vacuoles measure 2.6 to 4.3 microm long and 0.5 to 0.8 microm wide, are found near the tegumental surface but in small number. There are two layers of subtegumental myofibers, circular and longitudinal. The circular muscle myofibers are grouped in bundles whereas the longitudinal myofibers are densely distributed adjacent to the circular fibers. Numerous polygonal structures whose function has not yet been determined are located beneath the muscle layers.
el-Abdou
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N
Department of Biological Sciences, Faculty of Education, Ain Shams University, Cairo, Egypt.
Heckmann
R A
RA
D000818:Animals; D004534:Egypt; D005393:Fish Diseases / Q000469:parasitology; D005399:Fishes / Q000469:parasitology; D034582:Integumentary System / Q000033:anatomy & histology*; D009792:Oceans and Seas; D010273:Parasitic Diseases, Animal / Q000469:parasitology; D014200:Trematoda / Q000033:anatomy & histology* / Q000648:ultrastructure*