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- Title
A PHYLOGENETIC ANALYSIS OF THE SYNUROPHYCEAE USING MOLECULAR DATA AND SCALE CASE MORPHOLOGY.
- Authors
Lavau, Stephanie; Saunders, Gary W.; Wetherbee, Richard
- Abstract
The phylogeny of the Synurophyceae was investigated by parsimony analysis of scale case characters and small-subunit (18S) ribosomal RNA (rRNA), sequence data. Analysis of a 1 eustigmatophycean (outgroup), 3 chrysophycean, and 10 synurophycean 18S rRNA sequences corroborated the inference for ultrastrutural information that the Synurophyceae is a monophyletic assemblage. Tesselaria volvocina, which has been tentatively proposed as a member of the Synurophyceae, was confirmed as the earliest lineage within the Synurophyceae by both the molecular analysis and an evaluation of published ultrasstructural data. A second set of analyses investigated the relationship among Tessellaria volvocina, 6 Synura species, and 10 Mallomonas species varieties, with particular reference to the validity classifications of the Synurophycease and the characters upon which they are based. The molecular and scale case phylognies were not totally resolved but were largely congruent. The data sets were combined to produce another phylogeny, which showed greater resolution. The combined phylogeny weakly supported are representatives of Synura and Mallomoas as monophyletic groupings and also upheld several of the sections within these genera that are recognized by current classifications. However, some changes to the classification and delineation of thee genera are recommended and predicted. Both our 18S rRNA sequence and scale case data sets were more appropriate for examining the branching order among the more closely related taxa rather than resolving the deeper branching points of the synurophycean phylogeny.
- Subjects
PHYLOGENY; MORPHOLOGY; MALLOMONAS; SYNURA; NUCLEOTIDE sequence; TAXONOMY
- Publication
Journal of Phycology, 1997, Vol 33, Issue 1, p135
- ISSN
0022-3646
- Publication type
Article
- DOI
10.1111/j.0022-3646.1997.00135.x