Loricariichthys ucayalensis 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 occurs in the upper Amazon River drainage in Peru, its type locality being the Ucayali River. This species reaches a maximum total length of and is believed to be a facultative air-breather.
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