Phylogeny of Living Parasitic Lampreys (Petromyzontiformes) Based on Morphological Data

  title={Phylogeny of Living Parasitic Lampreys (Petromyzontiformes) Based on Morphological Data},
  author={H. Gill and C. Renaud and François Chapleau and Richard L. Mayden and I. Potter},
  pages={687 - 703}
  • H. Gill, C. Renaud, +2 authors I. Potter
  • Published 2003
  • Biology
  • Copeia
  • Abstract Relationships among the 18 extant species of parasitic lamprey (Petromyzontiformes) were determined using a cladistic analysis of 32 mainly morphological characters. Because previous analyses support all known fossils as phylogenetically older or the same age as living lampreys, a composite agnathan fossil was used as an outgroup. A consensus of three equally parsimonious trees revealed a trichotomy between a monophyletic northern hemisphere clade and the southern hemisphere genera… CONTINUE READING
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