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Capsular Protonephridia in Male Oligacanthorhynchus atrata (Acanthocephala)
T. T. Dunagan and R. -M. A. Rashed
The Journal of Parasitology
Vol. 74, No. 1 (Feb., 1988), pp. 180-185
Stable URL: http://www.jstor.org/stable/3282495
Page Count: 6
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The capsular type protonephridium and associated excretory bladder for male members of a single species in the genus Oligacanthorhynchus were examined by scanning electron microscopy. These excretory organs consisted of 2 groups of large, blunt, tightly packed flame bulbs covering a capsule-like chamber located on the anterior end of an expandable bladder. The entire complex was located on the dorsal surface at the junction of the dorsal ligament sac and genital sheath. Each protonephridium consisted of approximately 300-400 flame bulbs with the entire complex measuring 0.3-0.4 mm in length by 0.14-0.25 mm wide. Several electron micrographs are presented that show the bladder in different stages of filling. Both the anterior and posterior termini of the bladder appear to be attached to the underlying surfaces. Evidence is presented which suggests that the Oligacanthorhynchidae should be reorganized taking the nephridial type into consideration as a taxonomic characteristic.
The Journal of Parasitology © 1988 The American Society of Parasitologists