Abietinaria abietina (Linnaeus, 1758) (additional source)
Abietinaria fusca (Johnston, 1847) (redescription)
Abietinaria pulchra (Nutting, 1904) (redescription)
Bonneviella grandis (Allman, 1876) (redescription)
Campanularia crenata Allman, 1876 accepted as Tulpa crenata (Allman, 1876) (additional source)
Campanularia groenlandica Levinsen, 1893 (redescription)
Campanulina pumila (Clark, 1875) (redescription)
Cladocarpus bonnevieae Jäderholm, 1909 accepted as Aglaophenopsis bonnevieae (Jäderholm, 1909) (additional source)
Cladocarpus campanulatus Ritchie, 1912 (additional source)
Cladocarpus diana Broch, 1918 (redescription)
Cladocarpus formosus Allman, 1877 (redescription)
Cladocarpus pectiniferus Allman, 1883 accepted as Streptocaulus pectiniferus (Allman, 1883) (redescription)
Cladocarpus ramuliferus (Allman, 1874) accepted as Nematocarpus ramuliferus (Allman, 1874) (redescription)
Clava Gmelin, 1791 (redescription)
Clavidae McCrady, 1859 accepted as Hydractiniidae L. Agassiz, 1862 (status source)
Cuspidella quadridentatum (Hincks, 1874) accepted as Tetrapoma quadridentatum (Hincks, 1874) (redescription)
Diphasia rosacea (Linnaeus, 1758) (redescription)
Euphysa aurata Forbes, 1848 (additional source)
Filellum serpens (Hassall, 1848) (additional source)
Grammaria abietina (Sars, 1851) (additional source)
Grammaria borealis (Levinsen, 1893) (additional source)
Gymnogonos crassicaulis Bonnevie, 1898 accepted as Gymnogonos crassicornis Bonnevie, 1898 (basis of record)
Halecium birulai Spassky, 1929 (redescription)
Halecium curvicaule Lorenz, 1886 (redescription)
Halecium groenlandicum Kramp, 1911 (additional source)
Halecium laeve Kramp, 1932 (redescription)
Halecium minutum Broch, 1903 (redescription)
Halecium muricatum (Ellis & Solander, 1786) (additional source)
Halecium polytheca Linko, 1911 accepted as Halecium groenlandicum Kramp, 1911 (source of synonymy)
Halecium tenellum Hincks, 1861 (additional source)
Halecium textum Kramp, 1911 (redescription)
Halecium undulatum Billard, 1921 accepted as Halecium textum Kramp, 1911 (status source)
Halisiphonia arctica Kramp, 1932 (redescription)
Halitholus yoldiaarcticae (Birula, 1897) accepted as Halitholus yoldiaearcticae (Birula, 1897) (basis of record)
Hydractinia carica Bergh, 1887 (redescription)
Hydractinia echinata (Fleming, 1828) (additional source)
Hydractinia monocarpa Allman, 1876 (additional source)
Hydractinia serrata Kramp, 1943 accepted as Clavactinia serrata (Kramp, 1943) (additional source)
Hydrallmania falcata (Linnaeus, 1758) (additional source)
Lafoeina maxima Levinsen, 1893 (redescription)
Opercularella lacerata (Johnston, 1847) (redescription)
Schizotricha frutescens (Ellis & Solander, 1786) (redescription)
Sertularella gayi (Lamouroux, 1821) (additional source)
Sertularia fabricii Levinsen, 1893 (redescription)
Stegopoma plicatile (Sars, 1863) accepted as Ptychogena crocea Kramp & Damas, 1925 (redescription)
Streptocaulus pectiniferus (Allman, 1883) (redescription)
Symplectoscyphus bathyalis Vervoort, 1972 (redescription)
Tamarisca tamarisca (Linnaeus, 1758) (redescription)
Thuiaria alternitheca Levinsen, 1893 (additional source)
Thuiaria arctica (Bonnevie, 1899) (redescription)
Thuiaria articulata (Pallas, 1766) (additional source)
Thuiaria carica Levinsen, 1893 (redescription)
Thuiaria hartlaubi (Nutting, 1904) (additional source)
Zygophylax brownei Billard, 1924 (additional source)

Arctic Ocean for Selaginopsis arctica Bonnevie, 1899 
Bay of Biscay for Symplectoscyphus bathyalis Vervoort, 1972 
North Atlantic for Cladocarpus bonnevieae Jäderholm, 1909 

 Description

 for Abietinaria abietina (Linnaeus, 1758)

colonies erect and sturdy, 5-12 cm, pinnate, monosiphonic, colour of living colonies amber to honey. Stem slightly ... [details]

 Distribution

 for Abietinaria abietina (Linnaeus, 1758)

Widely recorded on both sides of the North Atlantic Ocean from the arctic region to Madeira, all Arctic Oceans, in ... [details]

 Distribution

 for Abietinaria pulchra (Nutting, 1904)

Vancouver Island, Bering Sea, Sea of Okhotsk, Chukchi Sea, East Siberian Sea, Laptev Sea, Kara Sea, White Sea, ... [details]

 Status

 for Halecium articulosum Clark, 1875

Often regarded as conspecific with Halecium sessile Normann, 1867 [details]

 Status

 for Halecium undulatum Billard, 1921

Due to absence of gonotheace in the type material the species it is indeterminable [details]

 Status

 for Thuiaria hartlaubi (Nutting, 1904)

May be conspecific with Thuiaria arctica (Bonnevie, 1899)  [details]

 Taxonomy

 for Clavidae McCrady, 1859

As the genus Clava is a member of the Hydractiniidae, Clavidae becomes a senior synonym of Hydractiniidae. A case ... [details]

 Type locality

 for Cladocarpus diana Broch, 1918

61.53°N 11.60°W, 1358 m and 60.62°N 27.87°W, 1504 m (Broch 1918) [details]

 Type locality

 for Halecium groenlandicum Kramp, 1911

Eastern Greenland, sound between Renskaer and Maroussia, 50-100 m, hard bottom [details]

 Type locality

 for Halecium laeve Kramp, 1932

Bredefjord, West Greenland, 365 m. [details]

 Type locality

 for Halecium minutum Broch, 1903

62.27°N 6.10°W, 110 m and 64.28°N 14.73W, 450 m [details]

 Type locality

 for Halecium undulatum Billard, 1921

Ostende [details]