Genus Rhodymenia is a type of red seaweed that belongs to the family Rhodymeniaceae. Synonyms for this genus include Rhodomyenia, Goniotrichum, and Glyptopeltis. It is distributed worldwide and has multiple uses, including as a food source for humans and animals and as a source of carrageenan, a thickening agent in various industries. Rhodymenia is commonly found in intertidal zones, where it grows attached to rocks or algae. The characteristics of this genus include flattened and blade-like thalli, which can range from a few centimeters to several meters in length. Its color can also vary, from a deep red to a purple-red hue.