Microcoelus (meaning "small hollow") is a dubious genus of small titanosaurian sauropod dinosaur native to Argentina. It is known from only a single dorsal vertebra. A left humerus was formerly referred to this species, but it is now considered to belong to Neuquensaurus. This species may be a synonym of the contemporary sauropod Neuquensaurus australis.
It was described by British paleontologist Richard Lydekker in 1893.
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