Corals are classified as animals in the phylum cnidaria. They are related to jellyfish and sea anemone.
anthozoa
Scyphozoa
Fire corals fall under the class Hydrozoa within the phylum Cnidaria. They are not true corals but are closely related, sharing characteristics with both corals and jellyfish. Fire corals are known for their stinging cells, which can cause painful reactions in humans. They are commonly found in tropical and subtropical marine environments.
Hydrozoans, sea anemones, & corals
The scientific or taxonomic name would be Gorgonia spp.
Corals are in the animal class of Anthozoa's, and live in compact colonies in the ocean reefs. People often confuse corals with plants because of their appearance.
Corals are classified as members of the phylum Cnidaria, which includes other animals such as jellyfish and sea anemones. Within the phylum Cnidaria, corals belong to the class Anthozoa. They are further divided into two subclasses: Hexacorallia (includes stony corals) and Octocorallia (includes soft corals).
Coral belongs to the phylum Cnidaria, which includes marine animals like jellyfish and sea anemones. Within this phylum, corals are classified under the class Anthozoa. They primarily fall into two main subclasses: Hexacorallia, which includes hard corals, and Octocorallia, which includes soft corals.
A zoantharian is any member of the Zoantharia (or Anthozoa) taxonomic class, including corals, sea pens, and sea anemones.
soft corals live deeper water than hard corals because soft corals do not create a hard outer skeleton as the hard corals do.
http://www.wonder-okinawa.jp/006/english/hyakka/doubutu/sangorui/index.html Use that link to figure out which type of coral you need! If you just want the general name, though, use Cnidarians
First off, all three types of organims are in the kingdom Animalia, and are not plants, they are animals. Jellyfish and Coral are both in the phylum cnidaria; jellyfish are further divided into class Medusozoa, which has a number of its own subgroups, whereas corals are in the class Anthozoa, which again is subdivided into a number of its own groups, but the what are usually considered corals are mostly in the groups Scleractinia(stony corals) and Octocorallia(soft corals, gorgonians, etc). The sponges on the otherhand are in a completely different phylum, Porifera, which is further divided into many different groups, and is not closely related to the Cnidarians.