Plectroglyphidodon lacrymatus, of the order of Perciformes and family of Pomacentridae (Damselfishes) is commonly known as the Whitespotted devil. The overall body colour is dark brown, and the back has blue or purple dots all over. Pectoral fins are yellowish and translucent with a black patch at the base. The caudal fin is whitish, at times tinged with yellow. The eyes are round and globular with a yellow iris, rimmed with green. The cheeks are tinged with purple. It has a total of 12 dorsal spines, 16 to 18 dorsal soft rays, 2 anal spines and 13 to 14 anal soft rays. Juveniles are greenish with blue dots all over the body and a black spot in the middle of the dorsal fin.
This species is present across the Indo-Pacific region. It is found in clear lagoons, near seaward reefs and in areas with mixed coral and rubbles. It is often seen near drop offs and steep slopes. The recorded depth range is between 1 to 40m. The diet consists of algae, small invertebrates and fish eggs. Males usually guard and aerate the eggs during reproductive periods.
The conservation status of this species has not been evaluated yet.
This species can reach a maximum recorded length of 10cm.