Mitochondrial and nuclear genes suggest that stony corals are monophyletic but most families of stony corals are not (Order Scleractinia, Class Anthozoa, Phylum Cnidaria).
Modern hard corals (Class Hexacorallia; Order Scleractinia) are widely studied because of their fundamental role in reef building and their superb fossil record extending back to the Triassic. Nevertheless, interpretations of their evolutionary relationships have been in flux for over a decade. Recent analyses undermine the legitimacy of traditional suborders, families and genera, and suggest that a non-skeletal sister clade (Order Corallimorpharia) might be imbedded within the stony corals. However, these studies either sampled a relatively limited array of taxa or assembled trees from heterogeneous data sets. Here we provide a more comprehensive analysis of Scleractinia (127 species, 75 genera, 17 families) and various outgroups, based on two mitochondrial genes (cytochrome oxidase I, cytochrome b), with analyses of nuclear genes (ss-tubulin, ribosomal DNA) of a subset of taxa to test unexpected relationships. Eleven of 16 families were found to be polyphyletic. Strikingly, over one third of all families as conventionally defined contain representatives from the highly divergent "robust" and "complex" clades. However, the recent suggestion that corallimorpharians are true corals that have lost their skeletons was not upheld. Relationships were supported not only by mitochondrial and nuclear genes, but also often by morphological characters which had been ignored or never noted previously. The concordance of molecular characters and more carefully examined morphological characters suggests a future of greater taxonomic stability, as well as the potential to trace the evolutionary history of this ecologically important group using fossils.
Fukami
Hironobu
H
Seto Marine Biological Laboratory, Field Science Education and Research Center, Kyoto University, Shirahama, Wakayama, Japan.
Chen
Chaolun Allen
CA
Budd
Ann F
AF
Collins
Allen
A
Wallace
Carden
C
Chuang
Yao-Yang
YY
Chen
Chienhsun
C
Dai
Chang-Feng
CF
Iwao
Kenji
K
Sheppard
Charles
C
Knowlton
Nancy
N
D000818:Animals; D037421:Anthozoa / Q000235:genetics* / Q000502:physiology*; D001499:Bayes Theorem; D002467:Cell Nucleus / Q000378:metabolism*; D004272:DNA, Mitochondrial / Q000235:genetics*; D004275:DNA, Ribosomal / Q000235:genetics; D019143:Evolution, Molecular; D005580:Fossils; D050259:Genes, Mitochondrial; D008928:Mitochondria / Q000378:metabolism; D015233:Models, Statistical; D010802:Phylogeny; D017422:Sequence Analysis, DNA; D013045:Species Specificity
D004272:DNA, Mitochondrial; D004275:DNA, Ribosomal
Bioinformatics. 2001 Dec;17(12):1246-7
11751242
Syst Biol. 2002 Jun;51(3):509-23
12079647
Biol Rev Camb Philos Soc. 2005 Nov;80(4):543-58
16221328
Science. 2008 Jul 25;321(5888):560-3
18653892
Mol Phylogenet Evol. 2002 May;23(2):137-49
12069546
Science. 2001 May 25;292(5521):1532-5
11375488
Bioinformatics. 2003 Aug 12;19(12):1572-4
12912839
Science. 2003 Jun 13;300(5626):1707-9
12805539
Genetics. 1998 Mar;148(3):1091-108
9539427
Proc Natl Acad Sci U S A. 2006 Jun 13;103(24):9096-100
16754865
J Mol Evol. 1989 Aug;29(2):170-9
2509717
J Mol Evol. 1997 Oct;45(4):397-411
9321419
Syst Biol. 2002 Jun;51(3):492-508
12079646
Mol Phylogenet Evol. 2007 Mar;42(3):776-88
17049278
Mol Ecol. 2002 Dec;11(12):2475-87
12453233
Mol Phylogenet Evol. 2004 Jan;30(1):167-77
15022767
Bioinformatics. 1998;14(9):817-8
9918953
Nature. 2004 Feb 26;427(6977):832-5
14985760