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The Pattern of Giant Nuclei in Neoechinorhynchus rutili (Acanthocephala: Neoechinorhynchidae)
Omar M. Amin and Mary Gunset
Transactions of the American Microscopical Society
Vol. 111, No. 1 (Jan., 1992), pp. 65-69
Stable URL: http://www.jstor.org/stable/3226729
Page Count: 5
You can always find the topics here!Topics: Spheroids, Cements, Lakes, Freshwater fishes, Developmental stages, Female animals, Animal glands, Older adults, Young adults, Reproduction
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The pattern of giant nuclei was studied in 300 specimens of Neoechinorhynchus rutili collected from carp, Cyprinus carpio, from the Mácha Lake fishpond system, Czechoslovakia. The giant hypodermal, lemniscal, and cement gland nuclei usually were spheroid or ovoid in prereproductive stages, elongate or lobulated in reproductively active adults, and spheroid in postreproductive adults; the latter stage was rarely encountered. Reproductive activity extends well beyond the season(s) during which gravid females are recovered in the field. Structural changes of giant nuclei were associated with the initiation and retention of the reproductive state of N. rutili. This pattern is similar to that reported for three other species of Neoechinorhynchus and thus may be of common occurrence in neoechinorhynchid acanthocephalans. Moreover, the pattern in N. rutili shows some overlap of stages and abbreviation of the postreproductive stage similar to the pattern of Neoechinorhynchus robertbaueri, which has a short lifespan (2-4 months) in its fish definitive host and a brief reproductive period.
Transactions of the American Microscopical Society © 1992 American Microscopical Society