Harttiella janmoli 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 known only from a small forest creek near Cottica Mountain in French Guiana, at an elevation of above sea level. This species reaches a standard length of .. It was described in 2012 as part of a taxonomic review of members of the loricariid tribe Harttiini native to the Guianas.
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