The Pseudancistrus pectegenitor lives in the demersal, freshwater environment.
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Pseudancistrus pectegenitor is known from the upper Río Orinoco river drainage, and can be distinguished from other members of the genus in having 10–11 dorsal-fin rays and adpressed cheek odontodes reaching to three or more plates beyond the opercle in adults. More
Pseudancistrus pectegenitor was collected in the main channel of the R More