Merging scleractinian genera : the overwhelming genetic similarity between solitary Desmophyllum and colonial Lophelia
Addamo, Anna M.
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KeywordMitochondrial genome; Microsatellites; Genetic divergence; Skeletal plasticity; Desmophyllum dianthus; Lophelia pertusa
In recent years, several types of molecular markers and new microscale skeletal characters have shown potential as powerful tools for phylogenetic reconstructions and higher-level taxonomy of scleractinian corals. Nonetheless, discrimination of closely related taxa is still highly controversial in scleractinian coral research. Here we used newly sequenced complete mitochondrial genomes and 30 microsatellites to define the genetic divergence between two closely related azooxanthellate taxa of the family Caryophylliidae: solitary Desmophyllum dianthus and colonial Lophelia pertusa. In the mitochondrial control region, an astonishing 99.8 % of nucleotides between L. pertusa and D. dianthus were identical. Variability of the mitochondrial genomes of the two species is represented by only 12 non-synonymous out of 19 total nucleotide substitutions. Microsatellite sequence (37 loci) analysis of L. pertusa and D. dianthus showed genetic similarity is about 97 %. Our results also indicated that L. pertusa and D. dianthus show high skeletal plasticity in corallum shape and similarity in skeletal ontogeny, micromorphological (septal and wall granulations) and microstructural characters (arrangement of rapid accretion deposits, thickening deposits). Molecularly and morphologically, the solitary Desmophyllum and the dendroid Lophelia appear to be significantly more similar to each other than other unambiguous coral genera analysed to date. This consequently leads to ascribe both taxa under the generic name Desmophyllum (priority by date of publication). Findings of this study demonstrate that coloniality may not be a robust taxonomic character in scleractinian corals.
© The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in BMC Evolutionary Biology 16 (2016): 108, doi:10.1186/s12862-016-0654-8.
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Erratum to: Merging scleractinian genera: the overwhelming genetic similarity between solitary Desmophyllum and colonial Lophelia Addamo, Anna M.; Vertino, Agostina; Stolarski, Jaroslaw; Garcia-Jimenez, Ricardo; Taviani, Marco; Machordom, Annie (BioMed Central, 2016-07-19)As a result of vendor errors being introduced during processing, the original version of this article was published with some duplication errors in Table 1.
Compositional variability in a cold-water scleractinian, Lophelia pertusa : new insights into “vital effects” Cohen, Anne L.; Gaetani, Glenn A.; Lundalv, Tomas; Corliss, Bruce H.; George, Robert Y. (American Geophysical Union, 2006-12-15)We analyzed Sr/Ca and Mg/Ca ratios in the thecal wall of Lophelia pertusa, a cold-water coral, using SIMS ion microprobe techniques. The wall grows by simultaneous upward extension and outward thickening. Compositional ...
Desmophyllum dianthus (Esper, 1794) in the scleractinian phylogeny and its intraspecific diversity Addamo, Anna M.; Reimer, James D.; Taviani, Marco; Freiwald, Andre; Machordom, Annie (Public Library of Science, 2012-11-28)The cosmopolitan solitary deep-water scleractinian coral Desmophyllum dianthus (Esper, 1794) was selected as a representative model species of the polyphyletic Caryophylliidae family to (1) examine phylogenetic relationships ...