Cyanoplax hartwegii is a species of chiton in the family Lepidochitonidae.

[1][2][3] Cyanoplax hartwegii can reach a length of about 30.8 millimetres (1.21 in).

The surface of the valves is commonly grayish green with dark markings.

[4] This species is present in Eastern Pacific (Alaska, Mexico and USA).

These molluscs live in intertidal to shallow subtidal zones [4]