Pseudochromis tapeinosoma, the blackmargin dottyback or horseshoe-tailed dottyback, is a species of ray-finned fish in the family Pseudochromidae. It is found in the north-western Indo-Pacific Ocean around Australia.Paxton, J.R., D.F. Hoese, G.R. Allen and J.E. Hanley, 1989. Pisces. Petromyzontidae to Carangidae. Zoological Catalogue of Australia, Vol. 7. Australian Government Publishing Service, Canberra, 665 p.
Description This species reaches a standard length of .
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