1. In diploblastic organisms, such as Cnidaria and Ctenophora, the gastrula has only ectoderm and endoderm.

2. PHYLUM COELENTERATA (=CNIDARIA) Coelenterates are radially symmetrical, diploblastic aquatic animals with diffused nervous system

3. Phylum Coelenterata (Cnidaria) is a diploblastic metazoa with tissue grade of construction having nematocyst and a single gastrovascular cavity.

4. Cnidarians are diploblastic, have organized tissue, undergo extracellular digestion, and use cnidocytes for protection and to capture prey.

5. The Cnidaria is a natural group of diploblastic organisms with a mostly acellular mesogloea that is derived from the ectoderm.

6. The Anthozoans are diploblastic animals developing from two epithelial germ cell layers: the ectoderm, facing the seawater, and the endoderm, facing the

7. Cnidarians are diploblastic -- that is, the body and tentacles consist of two cell layers, the endoderm (sometimes referred to as the gastrodermis) and the ectoderm (the epidermis).

8. 5) Diploblastic, 6) Euryphylous, 7) Aphodal, 8) Diploidal, 9) Appopyles, 10) Prosopyles, 11) Hypophare, 12) Metamerism, 13) Creeping, 14) Sketch and label - Nauplius larva, 15) Sketch and label- Zoaea larva, 16) Sketch and label - Neopilina

9. Definition and Origin of Cnidaria: Diploblastic metazoans with radial symme­try, tissues but rarely organs and a single central body cavity with mouth and tentacles but no anus, and the stinging cells or nematocysts, and with ciliated planula larva, called Cnidaria.