Scientific name:
Rhabdocalyptus dawsoni / Staurocalyptus dowlingi
Distinctive features:
1. Large, long, tube-shaped sponge
2. Often looks fuzzy due to sedimentation
3. Found hanging on deep rock walls and reefs or standing on rocks
4. White interior
Size:
Up to 5 ft (1.5 m) high and 3 ft. (91 cm) in diameter