1. This marine creature has a distribution that encompasses the entire world.
2. It can be discovered adhering to stones and rocks (coral reefs) in the area between the high and low tide lines.
3. The body is elliptical in shape and has a convex dorsal surface while the ventral surface is flat. The shell is found on the ventral side and is constructed of eight calcareous plates that run transverse to one another and overlap. These plates are organised in linear zones.
4. The mantle may be found all the way around the plates, and it is quite densely coated with spicules.
5. The foot takes up the majority of the space on the dorsal surface.
6. The foot and the mantle are separated by a groove known as the mantle groove. This groove contains around 80 ctenidia-like gills on either side of the foot.
7. The anal pore is located behind the foot, in the centre, and in front of the foot, in the middle of the segmented body, there is a huge head with a little hole that serves as the mouth; nevertheless, there is neither an eye nor tentacles.
8. There is a genital hole and an excretory pore located in the mantle groove on one side of the body.
9. The sexes are distinct, there is only one gonad, and development takes place in the trochophore larvae.
10. Nocturnal, herbivorous (they eat algae), and both a decorative and food.