Abstract
This molecular phylogenetic analysis of 18S ribosomal RNA (18SrDNA) gene sequences from 16 species of holothuroid, suggests strong support for an alternative taxonomic scheme to replace the existing classification. When trees drawn from the 18S rDNA data were constrained to show expected relationships between the holothourid orders, they were significantly worse than the best tree under SH tests. These analyses indicated strongly that the subclass Aspidochirotacea is paraphyletic. Sequences from the order Dendrochirotida grouped with aspidochiroitid sequences, with high bootstrap support, to the exclusion of the elasipod sequence. In line with recent morphological studies the order Apodida were a basal sister group to the other three holothuroid orders examined and the Dendrochirotida was a derived holothuroid order.
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Acknowledgements
The authors wish to dedicate this manuscript to the memory of Prof. Brendan Keegan and Dr. Richard Powell who have passed away. K.M.J. Lacey gratefully acknowledges the support and assistance provided throughout this research by Alexander Kerr, Dave Pawson and Dai Roberts. Thanks are also extended to Andrew Smith. This research was funded by Enterprise Ireland, National University of Ireland, Galway, and Wexford County Council. All experiments were carried out in Ireland and complied with current Irish laws.
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Communicated by O. Kinne, Oldendorf/Luhe
Brendan F. Keegan, Richard Powell: R.I.P
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Lacey, K.M.J., McCormack, G.P., Keegan, B.F. et al. Phylogenetic relationships within the class holothuroidea, inferred from 18S rRNA gene data. Marine Biology 147, 1149–1154 (2005). https://doi.org/10.1007/s00227-005-0009-2
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DOI: https://doi.org/10.1007/s00227-005-0009-2