Actiniidae is the largest family of sea anemones, to which most common, temperate, shore species belong. Most members of this family do not participate in symbioses with fishes. Three exceptions are the bubble-tip anemone, snakelocks anemone and Urticina piscivora.
Tube-dwelling anemones or ceriantharians look very similar to sea anemones but belong to an entirely different class of anthozoans. They are solitary, living buried in soft sediments. Tube anemones live inside and can withdraw into tubes, which are composed of a fibrous material made from secreted mucus and threads of nematocyst-like organelles known as ptychocysts. Within the tubes of these ceriantharians, more than one polyp is present, which is an exceptional trait because species that create tube systems usually contain only one polyp per tube. Ceriantharians were formerly classified in the taxon Ceriantipatharia along with the black corals but have since been moved to their own class, Ceriantharia.
Zoanthids are an order of cnidarians commonly found in coral reefs, the deep sea and many other marine environments around the world. These animals come in a variety of different colonizing formations and in numerous different colors. They can be found as individual polyps, attached by a fleshy stolon or a mat that can be created from small pieces of sediment, sand and rock. The term "zoanthid" refers to all animals within this order Zoantharia, and should not be confused with "Zoanthus", which is one genus within Zoantharia.
Edwardsia is a genus of sea anemones, the type of the family Edwardsiidae. They have eight mesenteries and live in tubes in the sand. The name, in Neo-Latin, commemorates the French zoologist Henri Milne-Edwards.
Amphianthus is a genus of sea anemones. It is the only genus in the monotypic family Amphianthidae.
Isozoanthus is a genus of anemone-like anthozoans in the order Zoantharia.
Parazoanthidae is a family of cnidarians.
Parazoanthus is a genus of anemone-like anthozoans in the order Zoantharia.
Cerianthus is a genus of tube-dwelling anemones in the family Cerianthidae. Members of the genus are found worldwide. They are predators, scavengers and omnivores.
Zoanthus is a genus of anthozoans in the family Zoanthidae. It is the type genus for its family and order.
Palythoa is a genus of anthozoans in the order Zoantharia.
Ceriantheomorphe is a genus of tube-dwelling anemones in the family Cerianthidae.
Terrazoanthus onoi is a species of uncertain validity of macrocnemic zoanthid first found in the Galapagos. It is potentially a junior synonym of Terrazoanthus patagonichus. It can be distinguished by its bright red oral disk colour, having about 32–40 tentacles, and having only basitrichs and mastigophores present in its pharynx.
Terrazoanthus sinnigeri is a species of uncertain validity of macrocnemic zoanthid first found in the Galapagos. It is potentially a junior synonym of Terrazoanthus patagonichus. It can be distinguished by commonly occurring on rubble and rocks on sandy bottoms, having about 30–36 tentacles, and numerous nematocysts in its pharynx.
Antipathozoanthus hickmani is a species of macrocnemic zoanthid first found in the Galapagos. It can be distinguished by its exclusive association with Antipathes galapagensis, and having about 40 tentacles.
Parazoanthus darwini is a species of macrocnemic zoanthid first found in the Galapagos. It can be distinguished by its association with sponges, by having about 24–30 tentacles and polyps embedded in a well-developed coenenchyme.
Hydrozoanthidae is a family of cnidarians belonging to the order Zoantharia.
Neozoanthus is a genus of corals belonging to the monotypic family Neozoanthidae.
Microzoanthus is a genus of cnidarians belonging to the monotypic family Microzoanthidae.
Nanozoanthus is a monotypic genus of corals belonging to the monotypic family Nanozoanthidae. The only species is Nanozoanthus harenaceus.
