In this article we will discuss about Coral Reefs:- 1. Definition of Coral Reef 2. Distribution and Conditions of Coral Reef Formation 3. Components 4. Types 5. Formation. Definition of Coral Reef: Vaughan (1917) has defined coral reef as "a ridge or mound of lime stone, the upper surface of which is near the surface of the sea and which [...]
The following points highlight the seventeen representative types of Coelenterata. The types are: 1. Bougainvillea 2. Physalia 3. Halistemma 4. Velella 5. Porpita 6. Lucernaria 7. Cyanea 8. Rhizostoma 9. Tubipora 10. Gorgonia 11. Corallium 12. Pennatula 13. Renilla 14. Adamsia 15. Fungia 16. Madrepora 17. Astraea. Coelenterata: Representative Type # 1. Bougainvillea: Bougainvillea (Fig. 35.1) is a dimorphic colony; [...]
The term Platyhelminthes "flatworms" was first proposed by Gaugenbaur (1859) and applied to the animals now included under that heading. The name Platyhelminthes has been derived from the Greek platys = flat + helmins = worms. At first, nemertines and others were also included but later were removed to other groups. The phylum is now restricted to three classes, Turbellaria, [...]