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The oral fimbriae of the lamprey geotria australis


Journal of Zoology (London) 188(2): 267-278
The oral fimbriae of the lamprey geotria australis
The frond-like fimbriae surrounding the oral disc of the lamprey, G. australis, were examined in living specimens, and by using histological, histochemical and ultrastructural techniques. Approximately 57 fimbriae are present in this species, with those at the posterior end of the disc being significantly larger than those in the anterior and lateral regions. The terminal finger-like projections of the fimbriae possess a stratified epithelium composed solely of a series of rows of mucous-producing cells. The mucus of the epithelial cells contains large amounts of N-acetyl neuraminic acid. Since the adjacent fimbriae are closely apposed when the lamprey is using its oral disc for suction, their flexible shape, mucous secretions and production of an increased surface area for attachment may help to provide a more efficient seal. Since fimbriae are present in all lampreys except those species belonging to the Mordaciidae, their absence in this latter family may be related to known differences in the behavior of their adult stages.

Accession: 006728670

DOI: 10.1111/j.1469-7998.1979.tb03404.x

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