Journal
MOLECULAR PHYLOGENETICS AND EVOLUTION
Volume 107, Issue -, Pages 166-178Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ympev.2016.10.011
Keywords
Choanoflagellates; Craspedida; Genome evolution; Holozoa; Molecular phylogeny; Taxonomic revision
Funding
- National Defense Science and Engineering Graduate fellowship from the United States Department of Defense
- National Science Foundation Central Europe Summer Research Institute Fellowship
- Chang-Lin Tien Fellowship in Environmental Sciences and Biodiversity
- Conseil Regional de Bretagne
- French Government Investissements d'Avenir program OCEANOMICS [ANR-11-BTBR-0008]
- NSF/EDEN IOS Grant [0955517]
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Recent studies have shown that molecular phylogenies of the choanoflagellates (Class Choanoflagellatea) are in disagreement with their traditional taxonomy, based on morphology, and that Choanoflagellatea requires considerable taxonomic revision. Furthermore, phylogenies suggest that the morphological and ecological evolution of the group is more complex than has previously been recognized. Here we address the taxonomy of the major choanoflagellate order Craspedida, by erecting four new genera. The new genera are shown to be morphologically, ecologically and phylogenetically distinct from other choanoflagellate taxa. Furthermore, we name five novel craspedid species, as well as formally describe ten species that have been shown to be either misidentified or require taxonomic revision. Our revised phylogeny, including 18 new species and sequence data for two additional genes, provides insights into the morphological and ecological evolution of the choanoflagellates. We examine the distribution within choanoflagellates of these two additional genes, EF-1A and EFL, closely related translation GTPases which are required for protein synthesis. Mapping the presence and absence of these genes onto the phylogeny highlights multiple events of gene loss within the choanoflagellates. (C) 2016 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license.
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