Hypostomus annectens is a species of freshwater ray-finned fish belonging to the family Loricariidae, the suckermouth armored catfishes, and the subfamily Hypostominae, the suckermouth catfishes. This catfish occurs in the Santiago-Cayapas River basin in northwestern Ecuador and in the Baudo, Patia and Guapi Rivers in southwestern Colombia. This species reaches a total length of and is believed to be a facultative air-breather.
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