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Belongs within: Actiniaria.
The Edwardsiidae are a family of sea anemones with eight coupled mesenteries at maturity (Daly 2002).
<==Edwardsiidae [Edwardsioidea]
|--MilneedwardsiinaeD02
| |--ParaedwardsiaD02
| | |--P. arenaria Carlgren 1905D02
| | `--P. sarsii (Duben & Koren 1847)D02
| |--EdwardsiellaD02
| | |--E. lineata (Verrill 1873)D02
| | `--+--E. carnea Gosse 1856D02
| | `--E. loveni (Carlgren 1893)D02
| `--+--Drillactis pallida (Verrill 1880)D02
| `--Nematostella Stephenson 1935D02, R22
| |--N. polaris (Carlgren 1921)D02
| `--N. vectensis Stephenson 1935D02
`--EdwardsiinaeD02
|--+--Edwardsianthus England 1987D02
| | |--E. gilbertensis (Carlgren 1931) [=Edwardsia gilbertensis]D02
| | `--E. pudica (Klunzinger 1877) [=Edwardsia pudica]D02
| `--ScolanthusD02
| | i. s.: S. curacaoensis (Pax 1924)D02
| | S. nidarosiensis (Carlgren 1942)D02
| |--S. intermedius (McMurrich 1893) [=Edwardsia intermedia]D02
| `--+--S. armatus (Carlgren 1931)D02
| `--S. callimorphus Gosse 1853D02
`--EdwardsiaD02
| i. s.: E. ivelliCG99
| E. japonicaRB14
| E. tricolorHS01
|--E. andresi Danielssen 1890D02
|--E. duodecimtentaculata (Carlgren 1931)D02
|--E. finmarchica Carlgren 1921D02
|--E. meridionalis Williams 1981D02
|--E. sipunculoides (Stimpson 1853)D02
|--E. vivipara Carlgren 1950D02
|--+--E. delapiae Stephenson 1935D02
| `--E. elegans Verrill 1869D02
`--+--+--E. timida de Quatrefages 1842D02
| `--E. vitrea Danielssen 1890D02
`--+--E. californica McMurrich 1913D02
|--E. hantuensis England 1987D02
|--E. tuberculata Duben & Koren 1847D02
`--+--E. claparedii (Panceri 1869)D02
`--+--*E. beautempsi de Quatrefages 1842D02
`--E. longicornis Carlgren 1921D02
*Type species of generic name indicated
References
[CG99] Carlton, J. T., J. B. Geller, M. L. Reaka-Kudla & E. A. Norse. 1999. Historical extinctions in the sea. Annual Review of Ecology and Systematics 30: 315–338.
[D02] Daly, M. 2002. A systematic revision of Edwardsiidae (Cnidaria, Anthozoa). Invertebrate Biology 121 (3): 212–225.
[HS01] Hayward, B. W., A. B. Stephenson, M. S. Morley, W. M. Blom, H. R. Grenfell, F. J. Brook, J. L. Riley, F. Thompson & J. J. Hayward. 2001. Marine biota of Parengarenga Harbour, Northland, New Zealand. Records of the Auckland Museum 37: 45–80.
[RB14] Rodríguez, E., M. S. Barbeitos, M. R. Brugler, L. M. Crowley, A. Grajales, L. Gusmão, V. Häussermann, A. Reft & M. Daly. 2014. Hidden among sea anemones: the first comprehensive phylogenetic reconstruction of the order Actiniaria (Cnidaria, Anthozoa, Hexacorallia) reveals a novel group of hexacorals. PLoS One 9 (5): e96998.
[R22] Runnegar, B. 2022. Following the logic behind biological interpretations of the Ediacaran biotas. Geological Magazine 159 (7): 1093–1117.