Skip to main content

Free Content Molecular morphometrics: contribution of ITS2 sequences and predicted RNA secondary structures to octocoral systematics

Download Article:
(PDF 838.052734375 kb)
Octocorals are among the largest and most diverse invertebrates on seamounts and in deep water but most of their systematics remains misunderstood. Molecular studies have produced new insights at higher levels. Unfortunately, most DNA sequences from both mitochondrial and nuclear genes have exhibited much conservation, preventing their use for closely related species. The internal transcribed spacers (ITSs) from the nuclear ribosomal-DNA have shown considerable variation among octocorals, and the ITS2 sequence has turned out to be a promising region. Here we provide new sequences and predicted RNA secondary structures for the ITS2 of fourteen octocorals. The sequences exhibited the highly conserved six-helicoidal ring-model structure found in yeast, insects, and vertebrates. A molecular morpho-metrics approach of 14 octocoral species produced 49 characters and 15 equally parsimonious trees. Consensus trees retained most of the relationships found with conserved mtDNA sequences. For instance, the node grouping Alaskagorgia aleutiana Sanchez and Cairns, 2004 with Muricea muricata (Pallas, 1766) was highly supported, which comprises independent support for the placement of this recently described deep-water species with the Plexauridae, in spite of having poor affinities according to morphology. Molecular morphometrics skips the issue of dealing with multiple insertions and deletions, and saturation in the primary information from sequence alignments. Nonetheless, the reliability and phylogenetic signal of ITS2 is better for intrageneric studies.

33 References.

No Supplementary Data.
No Article Media
No Metrics

Document Type: Abstract

Publication date: 2007-11-01

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more