''Ancistomus micrommatos'' is a species of catfish in the family Loricariidae. It is a freshwater fish native to South America, where it is known only from the Tocantins River basin in Brazil. The species reaches 11.9 cm (4.7 inches) in Fish measurement, standard length. Although originally described as a species of ''Hemiancistrus'' in 2003, a 2015 review conducted by Jonathan W. Armbruster (of Auburn University), David C. Werneke, and Milton Tan listed the species as valid within ''Ancistomus''.Armbruster, J. W., Werneke, D. C., & Tan, M. (2015). Three new species of saddled loricariid catfishes, and a review of Hemiancistrus, Peckoltia, and allied genera (Siluriformes). ''ZooKeys'', (480), 97–123. The same review also reported that no characteristics were found to separate ''A. micrommatos'' from its congeners ''Ancistomus spilomma, A. spilomma'' and ''Ancistomus spinosissimus, A. spinosissimus'', indicating that the three may actually all be the same species.

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{{Taxonbar, from1=Q115728658, from2=Q9002568 Fish described in 2003 Hypostominae