Common in the Solitary Islands Marine Park. Distributed throughout the Indo-West Pacific region. In Australia recorded from around Exmouth in Western Australia, the Great Barrier Reef in Queensland south to northern New South Wales.
Frequent coral branches, especially Pocillopera, depth from 1 to around 10 m. Specimens in lower photograph discovered in tidal rock pool.
Light yellowish brown legs and dark burgundy claws, pale blue carapace. Separated from the very similar Calcinus gaimardii by the different colouring of the ocular peduncles, in this species they are black with a subdistal blue ring. Grows to a carapace length of 12 mm, overall length to around 40 mm.
Poupin J. and M. Juncker, 2010 – A guide to the decapod crustaceans of the South Pacific. Published by CRISP and SPC, Noumea, New Caledonia, 320 pp., 366 photographs. Pp.296-7.
Reef Creature Identification, Tropical Pacific. Paul Humann, Ned DeLoach, New World Publications Inc, Jacksonville, Florida, USA, 2012 edition. p.160.
Atlas of Living Australia website at https://bie.ala.org.au/search?q=calcinus+morgani. Accessed 12/11/2018.