Campanulariidae is a family of animal

Animal

Animals are a major group of multicellular, eukaryotic organisms of the kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life. Most animals are motile, meaning they can move spontaneously and...

s in the phylum

Phylum

In biology, a phylum The term was coined by Georges Cuvier from Greek φῦλον phylon, "race, stock," related to φυλή phyle, "tribe, clan." is a taxonomic rank below kingdom and above class. "Phylum" is equivalent to the botanical term division....

 Cnidaria

Cnidaria

Cnidaria is a phylum containing over 9,000 species of animals found exclusively in aquatic and mostly marine environments. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey. Their bodies consist of mesoglea, a non-living jelly-like substance,...

, or stinging celled animals. Campanulariidae is composed entirely of hydroids, a Greek term meaning "Water Animals" applied to the plant-like polyp colonies of the class Hydrozoa

Hydrozoa

Hydrozoa are a taxonomic class of very small, predatory animals which can be solitary or colonial and which mostly live in saltwater. A few genera within this class live in freshwater...

. All species of Campanulariidae are aquatic in habitat, primarily inhabiting coastal regions and tidal pools.

Obelia

Obelia

Obelia is a genus in the class Hydrozoa, which consists of mainly marine and some freshwater animal species and have both the polyp and medusa stages in their life cycle...

contains probably the most well known species of this phylum, and include four species. All are around 20-35cm in height with a series of branches carrying the individual polyps. One species, Obelia longissima, is unique for its ability to produce Obelin, a photoprotein which allows for bioluminscence.

The genus Laomedea includes such species as Laomedea angulata and Laomedea flexuos, which are similar in appearance to the Obelia, though are smaller and lack a medusae stage present in Obelia.

Genera

• Billardia
• Campanularia - includes Campanula
• Clytia - includes Phialidium
• Gastroblasta
• Gastroblastea
• Gonothyraea
• Hartlaubella
• Laomedea
• Multioralis
• Obelia
  Obelia
  Obelia is a genus in the class Hydrozoa, which consists of mainly marine and some freshwater animal species and have both the polyp and medusa stages in their life cycle...
  
  
• Orthopyxis
• Pseudoclytia
• Rhizocaulus
• Silicularia
• Tulpa
• Verticillina
• Zelounies