Reanalysis of the Relationships among the Cirripedia and the Ascothoracida and the Phylogenetic Position of the Facetotecta (Maxillopoda: Thecostraca) Using 18S rDNA Sequences
2002; Oxford University Press; Volume: 22; Issue: 3 Linguagem: Inglês
10.1163/20021975-99990278
ISSN1937-240X
AutoresMarcos Pérez‐Losada, Keith A. Crandall, Gregory A. Kolbasov, Jens T. Høeg,
Tópico(s)Subterranean biodiversity and taxonomy
ResumoUntil now morphological and molecular datasets have failed to agree on phylogenetic relationships within the Crustacea Thecostraca (=Facetotecta, Ascothoracida, and Cirripedia). Three recent phylogenetic studies using 18S ribosomal DNA sequences from selected Cirripedia (Thoracica, Rhizocephala, and Acrothoracica) and Ascothoracida revealed Acrothoracica and Ascothoracida as a monophyletic group. This result disagrees with several larval and spermal morphological features supporting Cirripedia as a monophyletic group. We reanalyzed the same molecular data set including a new Facetotecta sequence using neighbor-joining and maximum likelihood, but incorporating the model of evolution that fits the data best, and maximum parsimony approaches. Our results strongly support the morphological hypothesis that the cirripedes form a monophyletic group, with the Acrothoracica as sister group to the Thoracica |$+$| Rhizocephala. Moreover, all the phylogenies showed the Facetotecta as the sister group to the remaining Thecostraca (Ascothoracida |$+$| Cirripedia).
Referência(s)