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Ulvophyceae
The Ulvophyceae or ulvophytes are a class of green algae,〔 distinguished mainly on the basis of ultrastructural morphology, life cycle and molecular phylogenetic data.〔Graham LE, Graham JM, Wilcox LW (2009) ''Algae''. 2nd Edition. Benjamin Cummings (Pearson), San Francisco, CA〕 The sea lettuce, ''Ulva'', belongs here. Other well-known members include ''Caulerpa'' and ''Acetabularia'' and ''Monostroma kuroshiensis''.
The Ulvophytes are diverse in their morphology and their habitat. Most are seaweeds such as those listed above. Others, such as ''Rhizoclonium'', ''Pithophora'' and some species of ''Cladophora'' live in fresh water and in some areas are considered weeds.
==Evolution==
The origin and early diversification of the Ulvophyceae likely took place in the late Neoproterozoic. Although most contemporary ulvophytes are marine macroalgae (seaweeds), ancestral ulvophytes may have been freshwater, unicellular green algae. Molecular phylogenetic evidence suggests that macroscopic growth was achieved independently in the various major lineages of Ulvophyceae (Ulvales-Ulotrichales, Trentepohliales, Cladophorales, Bryopsidales and Dasycladales).〔
Current hypothesis on relationships among the main clades of Ulvophyceae are shown below.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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