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Metamorphic changes in the intestine of three species of lampreys

Hilliard, R. W.; Bird, David J.; Potter, Ian C.


R. W. Hilliard

David J. Bird

Ian C. Potter


Measurements have been made of those changes which lead to increases in the surface area of the intestine during the metamorphosis of three species of lampreys. Although the intestine of the Southern Hemisphere lamprey, Geotria australis, increases in length by 1.13 times and in diameter by 1.12 times, the main factor influencing the 5.71 times increase in surface area is the development of longitudinal folds. The contribution of the typhlosole to the internal perimeter of the intestine is less in most life cycle stages of G. australis than in Lampetra spp. The changes in the various intestinal measurements of the nonparasitic species L. planeri parallel those of the presumed ancestral parasitic species, L. fluviatilis, during the first six stages of metamorphosis. However, the longitudinal folds, but not the typhlosole, subsequently start regressing in L. planeri just after the time when the rate of gonadal development increases markedly. An account is also given of the pattern of fold formation and the development of the typhlosolar vein in G. australis. Copyright © 1983 Wiley‐Liss, Inc.


Hilliard, R. W., Bird, D. J., & Potter, I. C. (1983). Metamorphic changes in the intestine of three species of lampreys. Journal of Morphology, 176(2), 181-196.

Journal Article Type Article
Publication Date Jan 1, 1983
Journal Journal of Morphology
Print ISSN 0362-2525
Electronic ISSN 1097-4687
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 176
Issue 2
Pages 181-196
Public URL
Publisher URL

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