Spectracanthicus murinus is a species of suckermouth armored catfish endemic to Brazil where it is found in the Tapajós River basin.

This species grows to a length of 6.4 centimetres (2.5 in) SL.

[1] S. murinus appears to be unique in the sub-family Ancistrinae in that it has lost many of the traits that describe this group, such as evertible cheek plates and modified opercle.

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