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The Corallinaceae are one of the two extant Coralline families of red algae; they are differentiated from the morphologically similar Sporolithaceae by their formation of grouped sporangial chambers, clustered into sori.
RedToL, the Red Algal Tree of Life Initiative funded by the National Science Foundation highlights the role red algae or Rhodophyta played in the evolution of our planet through secondary endosymbiosis.
However, other organism groups, such as calcifying algae, especially members of the red algae Rhodophyta, and molluscs (especially the rudist bivalves during the Cretaceous Period) have created massive structures at various times.
It lives primarily on the red algae Corallina officinalis, after which it takes its name, but is also known to live on Irish Moss (Chondrus crispus).
It favours rock pools and smooth rock covered with encrusting red algae such as Lithothamnion on which it feeds.