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- Title
Hemichordates and deuterostome evolution: robust molecular phylogenetic support for a hemichordate + echinoderm clade.
- Authors
Bromham, L D; Degnan, B M
- Abstract
Hemichordates were traditionally allied to the chordates, but recent molecular analyses have suggested that hemichordates are a sister group to the echinoderms, a relationship that has important consequences for the interpretation of the evolution of deuterostome body plans. However, the molecular phylogenetic analyses to date have not provided robust support for the hemichordate + echinoderm clade. We use a maximum likelihood framework, including the parametric bootstrap, to reanalyze DNA data from complete mitochondrial genomes and nuclear 18S rRNA. This approach provides the first statistically significant support for the hemichordate + echinoderm clade from molecular data. This grouping implies that the ancestral deuterostome had features that included an adult with a pharynx and a dorsal nerve cord and an indirectly developing dipleurula-like larva.
- Publication
Evolution & development, 1999, Vol 1, Issue 3, p166
- ISSN
1520-541X
- Publication type
Journal Article
- DOI
10.1046/j.1525-142x.1999.99026.x