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Radianthus crispa (Hemprich et Ehrenberg in Ehrenberg, 1834)

(photo of Valentina Lifatova: specimen living in reef tank)
   
Heteractis crispa

(photo of Ryanskiy Andrey, Russia)
Radianthus crispa

This species is quite popular among marine aquarium hobbyists. It is widely known under the name Heteractis crispa, but its valid name is Radianthus crispa. According to K.W. England (1988) Heteractis is a very different genus belonging to its own family Heteractidae and characterized by moniliform tentacles with characteristic swellings or protuberances which may be blister-like or more frequently forming a band across tentacle. Heteractis aurora has special nematocysts which do not occur in Radianthus crispa and other anemones of the family Stichodactylidae, this feature is considered as very important. Another important difference between genera Radianthus and Heteractis: in Radianthus some tentacles on the disk are arranged in radial series with more than one tentacle attached to a single radius on the disk (a space between two adjacent mesenteries), in Heteractis the tentacles are arranged in the same way as in many other anemones, there are no radial series of tentacles on the disk and only one tentacle is present between two adjacent mesenteries. Currently the genus Heteractis contains only one species (Heteractis aurora), and most other species referred to this genus (e.g. species referred as Heteractis malu, Heteractis magnifica and Heteractis crispa) - they all actually belong to Radianthus.
Taxonomic position:
Phylum: Cnidaria
Class: Anthozoa
Subclass: Hexacorallia
Superorder: Hexactiniida
Order: Actiniaria
Suborder: Nynantheae (Thenaria : Endomyaria)

Family: Stichodactylidae

Species: Radianthus crispa (Hemprich and Ehrenberg in Ehrenberg, 1834)

Species list of sea anemones:
  • Actinia equina
  • Actinodendron sp
  • Actinostella bradleyi
  • Actinostephanus haeckeli
  • Actinostola chilensis
  • Actinothoe sphyrodeta
  • Adamsia palliata
  • Aiptasia couchii
  • Aiptasia mutabilis
  • Alicia mirabilis
  • Alicia sansibarensis
  • Allantactis parasitica
  • Amplexidiscus fenestrafer
  • Andresia parthenopea
  • Anemonia alicemartinae
  • Anemonia viridis
  • Antholoba achates
  • Anthopleura elegantissima
  • Anthopleura hermaphroditica
  • Anthopleura orientalis
  • Anthopleura sola
  • Anthopleura xanthogrammica
  • Anthothoe chilensis
  • Armactinia antarctica
  • Artemidactis victrix
  • Aulactinia vancouverensis
  • Aulactinia vladimiri
  • Bathyphellia margaritacea
  • Boloceroides mcmurrichi
  • Boloceropsis platei
  • Calliactis polypus
  • Cereus herpetodes
  • Cereus pedunculatus
  • Cerianthus lloydii
  • Charisea saxicola
  • Cnidopus japonicus
  • Condylactis aurantiaca
  • Condylactis gigantea
  • Corallimorphus karinae
  • Corynactis californica
  • Corynactis carnea
  • Corynactis viridis
  • Cribrinopsis albopunctata
  • Cribrinopsis crassa
  • Cribrinopsis olegi
  • Cryptodendrum adhaesivum
  • Dactylanthus antarcticus
  • Diadumene lineata
  • Discosoma nummiforme
  • Dofleinia armata
  • Edwardsia inachi
  • Entacmaea quadricolor
  • Epiactis prolifera
  • Epizoanthus couchii
  • Epizoanthus fiordicus
  • Glyphoperidium bursa
  • Gonactinia prolifera
  • Gyractis octoradiata
  • Gyractis verrucosa
  • Halcampa arctica
  • Halcampoides sp
  • Halcampoides mediterranea
  • Halcurias pilatus
  • Heteractis aurora
  • Heterodactyla hemprichii
  • Hormathia lacunifera
  • Hormathia nodosa
  • Hormathia pacifica
  • Hormathia pectinata
  • Hormosoma scotti
  • Isaurus tuberculatus
  • Isoparactis fabiani
  • Isoparactis fionae
  • Isosicyonis alba
  • Korsaranthus natalensis
  • Liponema brevicornis
  • Macrodactyla doreensis
  • Megalactis griffithsi
  • Mesozoanthus fossii
  • Metridium farcimen
  • Metridium lobatum
  • Metridium senile
  • Metridium senile fimbriatum
  • Nemanthus sp
  • Oulactis concinnata
  • Pachycerianthus multiplicatus
  • Pachycerianthus solitarius
  • Paracondylactis sinensis
  • Paraisanthus tamarae
  • Paranthus niveus
  • Parazoanthus anguicomus
  • Parazoanthus axinellae
  • Parazoanthus elongatus
  • Peachia cylindrica
  • Phellia exlex
  • Phelliactis callicyclus
  • Phyllodiscus semoni
  • Phymactis papillosa
  • Phymanthea pluvia
  • Phymanthus crucifer
  • Phymanthus species
  • Protanthea simplex
  • Protopalythoa mutuki
  • Pseudocorynactis caribbeorum
  • Ptychodactis aleutiensis
  • Radianthus crispa
  • Radianthus magnifica
  • Radianthus malu
  • Rhodactis inchoata
  • Rhodactis indosinensis
  • Ricordea yuma
  • Sagartia elegans
  • Sicyonis heliodiscus
  • Spongiactis japonica
  • Stichodactyla gigantea
  • Stichodactyla haddoni
  • Stichodactyla tapetum
  • Stomphia coccinea
  • Telmatactis sp
  • Triactis producta
  • Urticina clandestina
  • Urticina columbiana
  • Urticina crassicornis
  • Urticina eques
  • Urticina felina
  • Urticina grebelnyi
  • Urticina kurila
  • Urticina mcpeaki
  • Verrillactis paguri

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