Hemichordates and deuterostome evolution: robust molecular phylogenetic support for a hemichordate plus echinoderm clade


Autoria(s): Bromham, LD; Degnan, BM
Data(s)

01/01/1999

Resumo

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.

Identificador

http://espace.library.uq.edu.au/view/UQ:36323

Idioma(s)

eng

Palavras-Chave #Evolutionary Biology #Developmental Biology #Genetics & Heredity #18s Ribosomal Dna #Cambrian Explosion #Statistical Tests #Rna #Gene #Substitution #Sequences #Rates #Simulation #Models
Tipo

Journal Article