The Ruggie (Coenobita rugosus), is a species of land hermit crab native to Australia and the east African coast to the southwest Pacific.
The Ruggie has four walking legs, a small pincer, a large pincer, and antennae. When threatened it is able to make a ‘chirping’ sound by rubbing its large pincer against its shell as a way to deter predators. They vary in color depending on nutritional intake and common colors include green, brown and tan; but black, white, pink, and blue have also been observed. They can be differentiated from other species of land hermit crabs by the pronounced striations (stitch marks) on their large pincer.
They can be 0.60 inches in length and their eyestalks are sandy in color and may have a brown stripe on the bottom of them. The bottom pair of the second antenna are light orange in color. Their big claw has 7 ridges on the upper part and there is usually hair on the inside of both claws. On the last pair of walking legs, on the second segment, it is flattened and the color is lighter. The abdomen is short and fat.
As with other species of land hermit crabs, the Ruggie are scavengers and will consume plants, dead fish, fruit and other detritus.