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Science 7 August 1992:
Vol. 257. no. 5071, pp. 787 - 789
DOI: 10.1126/science.1496398
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Articles

Science, Vol 257, Issue 5071, 787-789
Copyright © 1992 by American Association for the Advancement of Science

articles

Evidence from 18S ribosomal RNA sequences that lampreys and hagfishes form a natural group

DW Stock and GS Whitt

Department of Ecology, Ethology, and Evolution, University of Illinois, Urbana 61801.

Lampreys and hagfishes (cyclostomes) traditionally were considered to be a natural (monophyletic) group. Recently, the consensus of opinion, based largely on morphological analyses, has shifted to a view that lampreys are more closely related to jawed vertebrates (gnathostomes) than to hagfishes. Phylogenetic comparisons of 18S ribosomal RNA sequences from two hagfishes, two lampreys, a tunicate, a lancelet, and a number of gnathostomes support the monophyly of the cyclostomes. These data force a reassessment of several features of early vertebrate evolution.


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Molecular Phylogeny and Divergence Times of Deuterostome Animals.
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Cellular composition and ultrastructure of the gill epithelium of larval and adult lampreys: Implications for osmoregulation in fresh and seawater.
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Crystal Structures of Deoxy- and Carbonmonoxyhemoglobin F1 from the Hagfish Eptatretus burgeri.
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