Phylogenetic relationships within the class holothuroidea,inferred from 18S rRNA gene data |
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Authors: | Katrina?M?J?Lacey Email author" target="_blank">Grace?P?McCormackEmail author Brendan?F?Keegan Richard?Powell |
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Institution: | (1) Department of Zoology, Martin Ryan Institute, National University of Ireland, Galway, Ireland;(2) Department of Microbiology, National University of Ireland, Galway, Ireland;(3) Department of Biology, National University of Ireland, Maynooth, Country Kildare, Ireland |
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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.
Brendan F. Keegan, Richard Powell: R.I.P |
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Keywords: | |
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