Anthozoa is a class of marine invertebrates which includes the sea anemones, stony corals and soft corals. Adult anthozoans are almost all attached to the seabed, while their larvae can disperse as part of the plankton. The basic unit of the adult is the polyp; this consists of a cylindrical column topped by a disc with a central mouth surrounded by tentacles. Sea anemones are mostly solitary, but the majority of corals are colonial, being formed by the budding of new polyps from an original, founding individual. Colonies are strengthened by calcium carbonate and other materials and take various massive, plate-like, bushy or leafy forms.
Calliactis is a genus of sea anemones. Species in this genus are mutually symbiotic with hermit crabs. The anemone gets a place to live and discarded scraps of the crab's food in exchange for its help in defending the crab.
Mastigiidae is a family of true jellyfish. The family is native to the Indo-Pacific, but a species of Mastigias has been introduced to the West Atlantic, and Phyllorhiza punctata has been introduced to the West Atlantic and Mediterranean Sea.
Actinoscyphiidae is a family of sea anemones.
Hexacorallia is a class of Anthozoa comprising approximately 4,300 species of aquatic organisms formed of polyps, generally with 6-fold symmetry. It includes all of the stony corals, most of which are colonial and reef-forming, as well as all sea anemones, and zoanthids, arranged within five extant orders. The hexacorallia are distinguished from another class of Anthozoa, Octocorallia, in having six or fewer axes of symmetry in their body structure; the tentacles are simple and unbranched and normally number more than eight. These organisms are formed of individual soft polyps which in some species live in colonies and can secrete a calcite skeleton. As with all Cnidarians, these organisms have a complex life cycle including a motile planktonic phase and a later characteristic sessile phase. Hexacorallia also include the significant extinct order of rugose corals.
The spotted jelly, lagoon jelly, golden medusa, or Papuan jellyfish, is a species of jellyfish from the Indo-Pacific oceans. Like corals, sea anemones, and other sea jellies, it belongs to the phylum Cnidaria. Mastigias papua is one of the numerous marine animals living in symbiosis with zooxanthellae, a photosynthetic alga. Mastigias papua is one of the numerous marine animals living in symbiosis with zooxanthellae, a photosynthetic algae.
Atolla is a genus of crown jellyfish in the order Coronatae. The genus Atolla was originally proposed by Haeckel in 1880 and elevated to the monotypic family level, as Atollidae by Henry Bigelow in 1913. The six known species inhabit the mesopelagic zone. The medusae possess multiple lobes called lappets at the bell margin. Medusae also have eight tentacles, alternating with eight rhopalia, and twice as many lappets occur as tentacles.
Hydroidolina is a subclass of Hydrozoa and makes up 90% of the class. Controversy surrounds who the sister groups of Hydroidolina are, but research has shown that three orders remain consistent as direct relatives: Siphonophorae, Anthoathecata, and Leptothecata.
Sea anemones are a group of predatory marine invertebrates constituting the order Actiniaria. Because of their colourful appearance, they are named after the Anemone, a terrestrial flowering plant. Sea anemones are classified in the phylum Cnidaria, class Anthozoa, subclass Hexacorallia. As cnidarians, sea anemones are related to corals, jellyfish, tube-dwelling anemones, and Hydra. Unlike jellyfish, sea anemones do not have a medusa stage in their life cycle.
Edwardsiidae is a family of sea anemones. Edwardsiids have long thin bodies and live buried in sediments or in holes or crevices in rock.
Alicia sansibarensis, commonly known as tuberculate night anemone, is a species of sea anemone in the family Aliciidae. It is found in the Indian and Pacific Oceans. Alicia sansibarensis have tentacles that are very long and snake, which are used for the protection of crownfish from predators.
Boloceroides daphneae is a cnidarian which occurs in the depths of the East Pacific Rise and was described in 2006.
Daphne Gail Fautin was an American professor of invertebrate zoology at the University of Kansas, specializing in sea anemones and symbiosis. She is world-renowned for her extensive work studying and classifying sea anemones and related species. A large sea anemone-like cnidarian species has been named in her honor, originally called Boloceroides daphneae, but recently renamed to Relicanthus daphneae, after it was discovered to belong to a previously unknown cnidarian order. Fautin has published numerous scientific articles and texts—including co-authoring Encyclopædia Britannica's entry on cnidarians—and her publications have been widely cited by other researchers in the field. Among her current positions, she is the curator of the University of Kansas Natural History Museum and serves as vice president and commissioner of the International Commission on Zoological Nomenclature, overseeing the naming of new species.
Anenthemonae is a suborder of sea anemones in the order Actiniaria. It comprises those sea anemones with atypical arrangement of mesenteries for actiniarians.
The Enthemonae is a suborder of sea anemones in the order Actiniaria. It comprises those sea anemones with typical arrangement of mesenteries for actiniarians.
Actinostoloidea is a superfamily of sea anemones in the order Actiniaria.
Actinioidea is a superfamily of sea anemones in the order Actiniaria.
Metridioidea is a superfamily of sea anemones in the order Actiniaria. Members of this clade live in shallow subtropical waters worldwide.
Acontiophorum is a genus of sea anemones of the family Acontiophoridae.
