Related Experiment Videos
Phylogenetic relationships within the class Anthozoa (phylum Cnidaria) based on nuclear 18S rDNA sequences
E A Berntson1, S C France, L S Mullineaux
1Department of Biology, Woods Hole Oceanographic Institution, Redfield 120, Woods Hole, Massachusetts 02543, USA.
Molecular Phylogenetics and Evolution
|December 22, 1999
Summary
Phylogenetic analysis of Anthozoa using 18S ribosomal sequences clarifies evolutionary relationships. This study suggests Ceriantipatharia is not a valid subclass and reveals Corallimorpharia is closely related to Scleractinia.
Area of Science:
- Marine Biology
- Evolutionary Biology
- Genetics
Background:
- Anthozoa (corals and anemones) taxonomy relies on limited morphological data.
- Evolutionary relationships are difficult to ascertain due to scarce fossil records and debatable character significance.
Purpose of the Study:
- To investigate subclass and ordinal relationships within Anthozoa using 18S ribosomal RNA (rRNA) gene sequences.
- To resolve phylogenetic ambiguities for enigmatic taxa like Dactylanthus and Dendrobrachia.
Main Methods:
- Complete 18S rRNA gene sequences were analyzed for phylogenetic reconstruction.
- Comparative sequence analysis was employed to infer evolutionary relationships.
Main Results:
- The Subclass Ceriantipatharia was found to be an evolutionarily invalid grouping.
- The Order Corallimorpharia appears paraphyletic and closely allied with the Order Scleractinia.
- 18S rRNA gene analysis provided sufficient phylogenetic signal to delineate major Anthozoa groupings and suggest relationships for Dactylanthus and Dendrobrachia.
Conclusions:
- 18S rRNA gene sequencing offers valuable insights into Anthozoa phylogeny, clarifying major groupings.
- The study refines understanding of Anthozoa evolutionary history, particularly concerning the placement of Ceriantipatharia and Corallimorpharia.