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Erythrotrichiaceae is a 
red algae
Red algae, or Rhodophyta (, ; ), make up one of the oldest groups of eukaryotic algae. The Rhodophyta comprises one of the largest Phylum, phyla of algae, containing over 7,000 recognized species within over 900 Genus, genera amidst ongoing taxon ...
family in the order Erythropeltidales.
References
Red algae families Compsopogonophyceae {{Rhodophyta-stub