In addition, many corallimorphs will absorb nutrients directly from the water. They do rely on zooxanthellae and photosynthesis for energy. Mushroom corals are considered polytrophic. The “stalk” of the mushroom is called the column, and where it attaches to the substrate is called the pedal disc (think of it as a “foot”). On their discs, they do have tentacles-but they look more like little bumps, warts, or beads (these tentacles are usually referred to as papillae or verrucae). Their hypostomes, or mouths, protrude (think of pursed lips), unlike other corals that have flat or concave mouths. This is the umbrella shaped, or flat, circular disc which surrounds their opening. Mushroom corals are distinct from other corals by their oral disc. This article will treat Actinodiscus as a separate genus for the time being. In some circles, and from some collectors, wholesalers, and retailers, Actinodiscus is alternatively placed in two different families: Actinodiscidae or Discosomatidae, and is also sometimes combined with the genus Discosoma. Please scroll to the bottom of the page for more information about specific genera. Not all of these genera will be covered at this time. As more genetic data becomes available, some species may be reclassified or genera combined or renamed. The Corallimorpharia families and their genera are as follows: Actinodiscidae: Actinodiscus, Corallimorphidae: Corallimorphus, Corynactis, Pseudocorynactis, Ricordeidae: Ricordea, Discosomatidae: Actinodiscus, Amplexidiscus, Discosoma, Metarhodactis, Orinia, Paradiscosoma, Rhodactis, Sideractiidae: Sideractis, Nextactis, Schincteractisīy no means is this a set taxonomy. Being in the Hexacorallia subclass means that the polyps have tentacles in multiples of six. Mushroom corals are in the order Corallimorpharia and the subclass Hexacorallia (or also known as Zoantharia). They are commonly called “false corals” because they are similar to the stony corals of Scleractinia and belong in the same subclass (Hexacorallia), but they lack the calcareous skeleton. These are not to be confused with the stony mushroom corals of Fungiidae or the mushroom leather corals of Sarcophyton spp. Some hobbyists also call them disc anemones, false corals, elephant ear corals, umbrella corals, and mushroom false corals. Corallimorpharia corals are typically called mushroom corals.

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