The Phylum Cnidaria includes bluebottle jellyfish, anemones, corals and other jellyfish (except comb jellies). There are several Classes: Hydrozoa (Anemones, Corals), Scyphozoa (Jellyfish) and Cubozoa (box jellies). Cnidarians have two distinct body forms: polyps and medusae. Polyps have a tubular body attached to the substrate, or to each other in a colony (e.g. coral). Medusae are free swimming (e.g. adult jellyfish). The most important feature of Cnidarians is their stinging cells (nematocysts). These are in the tentacles and the body wall. Each stinging cell contains a coiled thread that, when pressure is applied, is ejected from the cell. These stinging cells can be used for defense or to capture prey. Some stinging cell threads have barbed ends and are connected to poison sacs, making them particularly nasty! hope that helps
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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
The phylum bulldogs belong in is, Chordate.
Echinoderms belong to the phylum Echinodermata.
Cockroaches belong to the phylum Arthropoda.
Hornworts belong to the phylum Anthocerotophyta.