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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
Published by: Wiley on behalf of American Microscopical Society
DOI: 10.2307/3226729
Stable URL: http://www.jstor.org/stable/3226729
Page Count: 5
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The Pattern of Giant Nuclei in Neoechinorhynchus rutili (Acanthocephala: Neoechinorhynchidae)
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Abstract

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.

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