Dentist specialties are recognized in those areas where advanced knowledge and skills are essential to maintain or restore oral health. The list of recognized dental specialties differs from country to country.
In contrast, radially symmetrical animals like jellyfish have a topside and a downside, but no identifiable front or back. The bilateria are a major group of animals, including the majority of phyla but not sponges, cnidarians, placozoans and ctenophores. For the most part, bilateral embryos are triploblastic, having three germ layers: endoderm, mesoderm, and ectoderm.
Coelenterata. (sÄ«lÄn'tÉrÄ`tÉ) , another name for the phylum Cnidaria Cnidariaor Coelenterata, phylum of invertebrate animals comprising the sea anemones, corals, jellyfish, and hydroids.Cnidarians are radially symmetrical (see symmetry, biological)...... Click the link for more information.oelenterata. (sÄ«lÄn'tÉrÄ`tÉ) , another name for the phylum Cnidaria Cnidariaor Coelenterata, phylum of invertebrate animals comprising the sea anemones, corals, jellyfish, and hydroids.