Grania
Encyclopedia
Grania is a genus of marine worms in the class Clitellata
Clitellata
Clitellata is a class of Annelid worms, characterized by having a clitellum - the 'collar' that forms a reproductive cocoon during part of their life cycle. The clitellates comprise around 8,000 species...

. They are found at many depths in sands throughout the world. They are generally about 2 centimetre (0.78740157480315 in) in length and mostly colorless or white, though Grania colorata, a recently discovered species found in the Great Barrier Reef
Great Barrier Reef
The Great Barrier Reef is the world'slargest reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,600 kilometres over an area of approximately...

, is green. 71 species in the genus Grania have been identified.
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