Appearance
Panulirus longipes grows to a maximum length of about 30 cm (12 in), but a more normal adult size is 20 to 25 cm (8 to 10 in) with a carapace length of up to 10 cm (4 in). The general colour is dark brown or bluish-brown and there are numerous circular white spots on the abdomen and rather fewer spots on other parts of the body. The legs have pale longitudinal stripes and sometimes a single white spot near the tip.

