| Preactiniidae | |
|---|---|
 | |
| The walking anemone, Preactis millardae | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Cnidaria |
| Class: | Hexacorallia |
| Order: | Actiniaria |
| Superfamily: | Actinioidea |
| Family: | Preactiniidae England in England & Robson, 1984 [1] |
| Genera | |
| |
Preactiniidae is a family of sea anemones in the order Actiniaria The family contains two species in two monotypic genera.
Anthopleura is a genus of sea anemones, of the family Actiniidae.
Octineon is the sole genus of sea anemones in the monotypic family Octineonidae.
Tube-dwelling anemones or ceriantharians look very similar to sea anemones but belong to an entirely different subclass 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 subclass, Ceriantharia.
The Valvatida are an order of starfish in the class Asteroidea, which contains 695 species in 172 genera in 17 families.
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 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.
Members of the genus Metridium, also known as plumose anemones, are sea anemones found mostly in the cooler waters of the northern Pacific and Atlantic oceans. They are characterized by their numerous threadlike tentacles extending from atop a smooth cylindrical column, and can vary from a few centimeters in height up to one meter or more. In larger specimens, the oral disk becomes densely curved and frilly.
Conus anemone, common name the anemone cone, is a species of sea snail, a marine gastropod mollusk in the family Conidae, the cone snails and their allies.
Monactis is a genus of sea anemones in the family Hormathiidae. There is only a single species known in this genus, Monactis vestita; it is found in the north-eastern Atlantic Ocean.
Gregoria fenestrata is a species of sea anemone in the monotypic genus Gregoria.
Ptychodactis is a genus of sea anemones. It is the only genus in the monotypic family Ptychodactinidae.
Urticina is a genus of relatively large and often colorful sea anemones in the family Actiniidae from the North Pacific, North Atlantic and Arctic Oceans.
Oulactis is a genus of sea anemones in the family Actiniidae, found in the intertidal zone. It contains the following species:
Triactis is a genus of sea anemone in the family Aliciidae. It is monotypic, having only one species – Triactis producta. This is found in shallow waters in the Indo-Pacific where it lives on the seabed, rocks and corals. It derives much of its energy needs from the symbiotic algae it contains. It also forms a mutualistic relationship with small Lybia crabs.
Ceriantheopsis is a genus of tube-dwelling anemones in the family Cerianthidae. Members of the genus are found only in the Atlantic Ocean. They are predators, scavengers and omnivores.
The cauliflower soft coral is a species of colonial soft coral in the family Nephtheidae.
Dofleinia armata, commonly known as the striped anemone or armed anemone, is a species of sea anemone in the family Actiniidae. It is the only species in the genus Dofleinia.
Allantactis is a monotypic genus of sea anemones, and Allantactis parasitica is the only species in the genus. This sea anemone lives at bathyal depths in the North Atlantic Ocean and has a symbiotic relationship with a gastropod mollusc.
Diadumene is a genus of sea anemones. It is the only genus in the monotypic family Diadumenidae.
Entacmaea is a genus of sea anemone in the family Actiniidae.
Bolocera is a genus of sea anemone in the family Actiniidae.
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