Ignelater luminosus is a bioluminescent species of click beetle native to the island of Puerto Rico, one of several Caribbean species in the genus Ignelater that are known as cucubanos.

Their paired prothorax light organs and single light organ on the anterior surface of the abdomen gives the appearance of two "headlights" and one "backlight", which it can turn off independently.

Because light pollution interferes with their reproduction, they prefer rural areas without much development.

Cucullos average half an inch in length.

The color of both of these insects' lights is bright green.