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Erythrotrichiaceae is a red algae family in the order 
Erythropeltidales
Erythropeltidales is a red algae order in the class Compsopogonophyceae
Compsopogonophyceae is a class of red algae.
References
External links
* http://www.shigen.nig.ac.jp/algae_tree/CompsopogonophyceaeE.html
Red algae classes
...
.
References
Red algae families Compsopogonophyceae {{Rhodophyta-stub