1887

Abstract

Multilocus sequence analysis (MLSA) was performed on representatives of (including species previously assigned to the genus ) and related taxa. Neighbour-joining (NJ), maximum-parsimony (MP) and maximum-likelihood (ML) phylogenies of , , , , and 16S rRNA genes were compared. The data confirm that the potential for discrimination of species is greater using MLSA of housekeeping genes than 16S rRNA genes. In incongruence-length difference tests, the 16S rRNA gene was found to be significantly incongruent with the other genes, indicating that this gene should not be used as a single indicator of relatedness in this group. Significant congruence was detected for , and . Analyses of concatenated sequences of , and genes yielded very similar NJ, MP and ML trees, with high bootstrap support. In addition, analysis of a concatenation of all six genes essentially produced the same result, levelling out potentially conflicting phylogenetic signals. This new evidence supports the proposal to unite and in a single genus. Support for an alternative solution preserving the two genera is less strong. In view of the opinions expressed by the Judicial Commission, the name of the genus should be , as proposed by Young [ Young, J. M. (2003) . , 2107–2110]. Data obtained previously and these new data indicate that and ‘’ are not heterotypic synonyms, but represent separate species. However, transfer to the genus is not possible at present because the species name is the subject of a pending Request for an Opinion, which would affect whether a novel species in the genus or a new combination based on a basonym would be created.

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2007-03-01
2019-10-21
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