-Food is passed through central mouth to internal cavity in which digestion takes place.
-Simple colonial coral.
-7 species lost.
|
-Radially symmetrical coral consisting of two layers of cells united by acellular layer of jelly. -Food is passed through central mouth to internal cavity in which digestion takes place. -Simple colonial coral. |
| -Became fully extinct at the Permo-Triassic boundary. -7 species lost. |
|