Abstract
Metamorphosis of the nonparasitic southern brook lamprey, I. gagei, is described within 7 stages on the basis of external structural changes. The sequence of external changes including the development of eyes, oral disc, teeth, tongue, oral fimbriae and lateral line was remarkably consistent among individuals. The initiation of metamorphosis during late Aug.-early Sept. is considerably later than that found for many northern-hemisphere lampreys. The duration of metamorphosis in L gagei, approximately 6 months, is longer than that required by most species. Sex ratio of metamorphosing and adults showed a slight preponderance of females. No evidence was found to indicate differences in distribution
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