Abstract
Among students of lamprey taxonomy, there has been agreement on the common names for the least brook lamprey and American brook lamprey, two nonparasitic species of eastern North America. However, there still is a disagreement as to their scientific names. On the basis of a critical study of original descriptions and drawings of American authors of the last century, we reached the conclusion that the length of the urogenital papilla in spawning males is a very important taxonomic character. Therefore, we propose that the name for the least brook lamprey, which has a long urogenital papilla, is Lampetra lamottenii (Lesueur); and for the American brook lamprey, with a short papilla, is Lethenteron wilderi (Gage).
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