The typical size is between 30 and 60 cm, but it can grow to almost 1 m. It has been observed as far north as Maryland and as far south as Brazil. Usually found between 3 and 80 metres depth, it swims over reefs and sandy areas, where it feeds on algae by scraping it with its teeth fused into a beak.
- Rocha, L.A., Choat, J.H., Clements, K.D., Russell, B., Myers, R., Lazuardi, M.E., Muljadi, A., Pardede, S. & Rahardjo, P. 2012. Scarus coelestinus. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 09 January 2013.
- Humann, DeLoach (2002). Reef Fish Identification - Florida Caribbean Bahamas. New World Publications, Inc. ISBN 1-878348-30-2.
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