Corystes cassivelaunus (masked crab)
| Phylum: | Arthropoda |
| Subphylum: | Crustacea |
| Class: | Malacostraca |
| Occurrence: | Shallow water up to 50 m, on all bottoms. |
| Appearance: | Carapace triangular, up to 4 cm in size; mostly brownish, camouflaged with algae or sponges (camouflage gives it its name). Two long, V-shaped tips form the rostrum. First pair of walking legs with claws. |