Evidence from 18S Ribosomal RNA Sequences That Lampreys and Hagfishes Form a Nat

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Title:
Evidence from 18S Ribosomal RNA Sequences That Lampreys and Hagfishes Form a Natural Group Authors:
Stock, David W.; Whitt, Gregory S. Publication:
Science, Volume 257, Issue 5071, pp. 787-789 (Sci Homepage) Publication Date:
08/1992 Origin:
JSTOR DOI:
10.1126/science.1496398 Bibliographic Code:
1992Sci...257..787S

Abstract

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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