Panulirus polyphagus grows to a length of about . The antennal plate bears two large spines and there are no transverse grooves on the abdominal segments. Distinctive colour features by which this species can be distinguished from other spiny lobsters include a greenish-grey background colour and a thin white band near the hind edge of each segment. In Europe, the otherwise similar native species, the north eastern
Atlantic spiny crawfish (
Panulirus regius), has four large spines on the antennal plate, and smooth grooves on the abdominal segments. ==Distribution and habitat==