The seaweed blenny can grow up to about 4 inches in length.

The seaweed blenny occurs in tropical and subtropical waters of the western Atlantic ocean, ranging from the Gulf of Maine in the United States southward through Bermuda, the Bahamas, the Caribbean sea, and the Gulf of Mexico, down to the coast of Brazil.

The seaweed blenny lives mainly in shallow waters, often down to about 80 feet deep, on rocky bottoms covered with algae and sometimes near mangrove roots, debris or sandy areas.

The seaweed blenny is listed as many other marine species within The IUCN Red List of threatened species. The seaweed blenny appears in the IUCN Red List since 2014 within the category Least Concern !