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The oral fimbriae of the lamprey geotria australis


, : The oral fimbriae of the lamprey geotria australis. Journal of Zoology (London) 188(2): 267-278

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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Related references

Cook R.D.; Hilliard R.W.; Potter I.C., 1990: Oral papillae of adults of the southern hemisphere lamprey geotria australis. The morphology, cell types and innervation of the several small papillae (.hivin.x = 17) and two larger papillae, which together form a ring just outside the fimbriae surrounding the suctorial disc of adult Geotria australis, have been studied usi...

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