Panulirus penicillatus is a species of spiny lobster that lives on shallow rocky and coral reefs in the tropical Indo-Pacific region.

The colour of this spiny lobster is variable, ranging from yellowish-green to rusty-brown or bluish-black.

[3] Panulirus penicillatus occurs in the tropical and subtropical Indian and Pacific Oceans.

[4] It is found in shallow water, usually at depths of less than 4 metres (13 ft) on rocky surfaces, on the outer slopes of reefs and in water channels, where it hides in crevices during the daytime and emerges at night.

The longevity is probably at least ten years and the female fecundity is several hundred thousand eggs.