Cnidaria families

Petasidae is a family of cnidarians belonging to the order Trachymedusae.

Sertulariidae is a family of hydrozoans.

Preactiniidae is a family of sea anemones in the order Actiniaria The family contains two species in two monotypic genera.

Lobonematidae is a family of jellyfishes belonging to the order Rhizostomeae.

Bythotiaridae is a family of cnidarians belonging to the order Anthoathecata.

Spongiodermidae is a family of corals belonging to the order Scleralcyonacea.

Aurelianidae is a family of sea anemones, comprising the following genera: Actinoporus Duchassaing, 1850 Aureliana Gosse, 1860

Rhodaliidae is a family of siphonophores. In Japanese they are called ().

Stylopathidae is a family of corals belonging to the order Antipatharia.

Bougainvilliidae is a family of marine hydroids in the class Hydrozoa. Members of the family are found worldwide. There are sixteen accepted genera and about ninety-three species.

Cytaeididae is a family of cnidarians belonging to the order Anthoathecata.

Forskalia is a genus of siphonophores. It is the only genus in the monotypic family Forskaliidae.

Sideractinidae is a family of corals belonging to the order Corallimorpharia.

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Zancleidae is a family of cnidarians belonging to the order Anthoathecata.

Arulidae is a family of corals belonging to the order Malacalcyonacea.

Ptychogastriidae is a family of cnidarians belonging to the order Trachymedusae.

Epizoanthidae is a family of cnidarians.

Chunellidae is a family of sea pens, a member of the subclass Octocorallia in the phylum Cnidaria.

Eirenidae is a family of hydrozoans.

Margelopsidae is a family of cnidarians belonging to the order Anthoathecata.

Plumulariidae is a family of hydrozoans.

Stenocyathidae is a family of corals belonging to the order Scleractinia.

Hydrocorynidae is a family of cnidarians belonging to the order Anthoathecata.

Kirchenpaueriidae is a family of hydrozoans in the superfamily Plumularioidea. Their hydrocladia are characteristically set in an alternating fashion as one progresses along the stems, forming two neat rows except in Oswaldella laertesi, which has three such rows. The alternating placement of the hydrocladia can be used to distinguish them from the Plumulariidae which may look superficially similar.

Lobophylliidae is a family of large polyp stony corals. The family was created in 2009 after a revision of the "robust" families of Faviidae, Merulinidae, Mussidae and Pectiniidae, which had been shown to be polyphyletic. The family Lobophylliidae was formed out of the Indo-Pacific species that had traditionally been included in Mussidae, and some of the species which had previously formed Pectiniidae, the remaining species from Pectiniidae having been merged into Merulinidae. The type genus is Lobophyllia.

Moerisiidae is a family of cnidarians belonging to the order Anthoathecata.

Liponematidae is a family of sea anemones.

Zancleopsidae is a family of hydrozoans in the order Anthomedusae.

Solmarisidae is a family of hydrozoans in the order Narcomedusae. The name is sometimes spelled "Solmaridae".

Sphaerocorynidae is a family of cnidarians belonging to the order Anthoathecata.

Pyrostephidae is a family of cnidarians belonging to the order Siphonophorae.

Sphenopidae is a family of cnidarians.

Myxobolidae is a family of myxosporean parasites which typically infect freshwater fishes, and includes the economically significant species, Myxobolus cerebralis. They have been shown to have a complex life cycle, involving an alternate stage in an invertebrate, typically an annelid or polychaete worm.

Protiaridae is a family of cnidarians belonging to the order Anthoathecata.

Hippopodiidae is a family of cnidarians belonging to the order Siphonophorae.

Scleroptilidae is a family of corals belonging to the order Pennatulacea.

Bathyphelliidae is a family of sea anemones.

Tripedaliidae is a family of box jellyfish within class Cubozoa.

Ptilocodiidae is a family of hydrozoans in the order Anthoathecata.

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Haleciidae is a family of hydrozoans. Their hydroid colonies emerge from a creeping hydrorhiza and usually form upright branching colonies, although some species' colonies are stolonal. Their gonophores are typically sporosacs, growing singly or bunched into a glomulus. They remain attached to the hydroids or break off to be passively drifted away; in a few, the gonophores are naked.

Acrophytidae is a family of corals belonging to the order Malacalcyonacea.

Lafoeidae is a family of hydrozoans.

Andresiidae is a family of sea anemones belonging to the order Actiniaria.

Boreohydridae is a family of cnidarians belonging to the order Anthoathecata.

Tiarannidae is a family of hydrozoans belonging to the order Leptothecata.

Thyroscyphidae is a family of cnidarians belonging to the order Leptothecata.

Actinoscyphiidae is a family of sea anemones containing two genera, which are:

Syntheciidae is a family of hydrozoans belonging to the order Leptothecata.

Galatheanthemidae is a family of sea anemones belonging to the order Actiniaria.

Aeginidae is a family of hydrozoans in the order Narcomedusae. The family comprises 6 genera and 8 species.

Teissieridae is a family of cnidarians belonging to the order Anthoathecata.

Schizocyathidae is a family of stony corals. There are currently three genera included in this family and each of them is monotypic. Members of the family are azooxanthellate, deep water species.

Cuninidae is a family of hydrozoans in the order Narcomedusae. They have dome-shaped bells and tentacles set above the undulating margin of the bell. Their gastric pouches contain the gonads situated in line with the tentacles, the number of pouches being the same as the number of tentacles. The pouches do not extend below the points of origin of the primary tentacles. Members of some genera have a peripheral canal system and others do not. No radial canals or secondary tentacles are present.

The Coscinaraeidae are a family of stony corals found in the Indo-Pacific region.

Sphaeronectidae is a family of cnidarians belonging to the order Siphonophorae.

Campanulinidae is a family of cnidarians belonging to the order Leptomedusae.

Anthemiphylliidae is a family of corals belonging to the order Scleractinia.

Halopterididae is a family of hydrozoans.