Sturisomatichthys frenatus is a species of freshwater ray-finned fish belonging to the family Loricariidae, the suckermouth armored catfishes, and the subfamily Loricariinae, the mailed catfishes. This catfish is endemic to Ecuador where it occurs in the Santiago-Cayapas drainage system. This species attains a standard length of and species in the genus Sturisomatichthys are known to be facultative air breathers.
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