ibclogo XVI International Botanical Congess


Abstract Number: 4322
Session = 16.5.4


COMPARATIVE DEVELOPMENTAL MORPHOLOGY AND MOLECULAR SYSTEMA-TICS OF RED ALGAE BASED ON rbcL SEQUENCE ANALYSIS.


Fredericq S., M. Hommersand & W. Freshwater, USL, UNC


We have obtained sequences from over 600 species representing each of the orders and most families of the Rhodophyta. This expanded data set permits a reevaluation of the naturalness of assemblages recognized in traditional and recent systems of classification. At higher taxonomic levels, molecular-based phylogenies highlight the evolution of the earliest stages in female reproductive development and its formation in relation to thallus growth. We will present phylogenetic hypotheses and classification criteria derived from re-interpretation of such ontogenetic evidence for the major red algal lineages. Families recognized by Kylin (1956) are mostly resolved as monophyletic clades, but certain interfamilial and ordinal relationships are not supported


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