Molecular Biology and Evolution, Vol 12, 679-689, Copyright © 1995 by Society for Molecular Biology and Evolution
D Bridge, CW Cunningham, R DeSalle and LW Buss
The evolutionary history of cnidarian life cycles has been debated since
the 1880s, with different hypotheses favored even by current textbooks.
Contributing to the disagreement is the fact that the systematic
relationships of the four cnidarian classes have received relatively little
examination using modern systematic methods. Here we present analyses of
class-level relationships based on 18S ribosomal DNA (rDNA) sequence,
mitochondrial 16S rDNA sequence, mitochondrial genome structure, and
morphological characters. DNA sequences were aligned using a repeatable
parsimony-based approach incorporating a range of alignment parameters.
Analyses of individual data sets and of all data combined are unanimous in
grouping the classes possessing a medusa stage, leaving the holobenthic
Anthozoa basal within the phylum.
ORIGINAL ARTICLE
Class-level relationships in the phylum Cnidaria: molecular and morphological evidence
Department of Invertebrates, American Museum of Natural History, New York, New York 10024, USA.
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