A saki recorded in the Peruvian Amazon, including the Pacaya-Samiria area.
Adult males in the description had black fur finely mixed with pale hairs, faint white spots above the eyes, and a short dark orange-brown throat ruff.
A review of earlier feeding studies reports that P. isabela used Eschweilera seeds heavily in a seasonally flooded forest in western Amazonia.
An extinction-risk assessment has not been added yet.