Congruence between nuclear and mitochondrial genes in Demospongiae: A new hypothesis for relationships within the G4 clade (Porifera: Demospongiae)

C.C. Morrow, B.E. Picton, D. Erpenbeck, N. Boury-Esnault, Christine Maggs, A.L. Allcock

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)

Abstract

The current morphological classification of the Demospongiae G4 clade was tested using large subunit ribosomal RNA (LSU rRNA) sequences from 119 taxa. Fifty-three mitochondrial cytochrome oxidase 1 (CO1) barcoding sequences were also analysed to test whether the 28S phylogeny could be recovered using an independent gene. This is the largest and most comprehensive study of the Demospongiae G4 clade. The 28S and CO1 genetrees result in congruent clades but conflict with the current morphological classification. The results confirm the polyphyly of Halichondrida, Hadromerida, Dictyonellidae, Axinellidae and Poecilosclerida and show that several of the characters used in morphological classifications are homoplasious. Robust clades are clearly shown and a new hypothesis for relationships of taxa allocated to G4 is proposed.
Original languageEnglish
Pages (from-to)174-190
Number of pages17
JournalMolecular Phylogenetics and Evolution
Volume62
Issue number1
Early online date07 Oct 2011
DOIs
Publication statusPublished - Jan 2012

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics

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