From RTAW Reefpedia
Organisms within the sub-Kingdom Eumetazoa have several characteristics that identify them as such. These characteristics are;
- true tissues that is organised into germ layers, and
- an embrio that goes through a gastrula stage (which follows the blastula stage, allowing the positioning of the three embryonic germ layers, endoderm, ectoderm and mesoderm).
Eumetazoa consists of three super phyla (that are of importance) as follows:
- Bilateria:Deuterostomia - groups such as echinoderms and vertebrates
- Bilateria:Protostomia - this group include the great majority of invertebrates
- Protostomia:Platyzoa - groups such as flatworms
- Radiata - corals, jellyfish, hydroids and comb jellies.