Fraser, 1914a : 171 Diplocyathus gracilis Leloup, 1930 : 6 Fraser, 1937a : 114 Naumov, 1960 : 462 Hydrodendron gracilis Millard, 1973 : 973 Rees & Vervoort, 1987 : 20 Names of hydroids (Cnidaria, Hydrozoa) established by Charles McLean Fraser (1872 - 1946), excluding those from Allan Hancock Expeditions Calder, Dale R. Choong, Henry H. C. Zootaxa 2018 2018-10-02 4487 1 1 83 Fraser, 1914 a Fraser 1914 [151,537,1883,1909] Hydrozoa Haleciidae Ophiodes GBIF Animalia Leptothecata 35 36 Cnidaria species gracilis     Ophiodes gracilis  Fraser, 1914a: 171, pl. 22, figs. 82Α–D.    Diplocyathus gracilis.—  Leloup, 1930: 6.     Ophiodissa gracilis.—  Fraser, 1937a: 114, pl. 23, figs. 129a–d.     Plumularia magellanica moneroni  Naumov, 1960: 462, fig. 351.  Not  Hydrodendron gracilis.—  Millard, 1973: 973: 33, figs. 6F, G; 1975: 164, figs. 53E–J.     Hydrodendron gracile.—  Rees & Vervoort, 1987: 20.   Type material.None known to exist.    Typelocality. Canada, British Columbia: Clarke Rock; Pylades Channel; Rose Spit( Graham Island, Haida Gwaii) ( Fraser 1914a).  Current status.Valid, as  Hydrodendron gracile( Fraser, 1914a), although the species needs reassessment.   Remarks.The only material of  Ophiodes gracilis Fraser, 1914ain the Fraser Hydroid Collection at the RBCM (BCPM 976-00510-001: Canada, British Columbia, Houston Stewart Channel) is not from any of the typelocalities listed by Fraser (1914a)and is not part of the typeseries. Instead, it is from later collections made in Houston Stewart Channel, a passage separating Moresby and Kunghit islands in the Queen Charlotte Islands (=Haida Gwaii) ( Fraser 1936b).  Fraser’s (1914a)account of this hydroid, assigned by Rees & Vervoort (1987)to  Hydrodendron Hincks, 1874as  H. gracile, was based on sterile material. Specimens examined by Antsulevich (1987, 2015) from the Pacific coast of the Russian Federation lacked gonophores as well. Meanwhile, fertile hydroids assigned to the species by Millard (1973, 1975, as  H. gracilis) are unlikely to have been conspecific. Indeed, records of  H. gracileoutside the boreal North Pacific, and especially from tropical waters, need to be re-considered. Hydroids of this species, identified as  Plumularia magellanica moneroniby Naumov (1960)from Tatar Strait (Gulf of Tatary), Russian Federation, are almost certain to be distinct from  Plumularia magellanica Hartlaub, 1905(=  Kirchenpaueria magellanica) (Horia R. Galea, personal communication, 22 March 2018). Naumov’s specimens were also sterile. The species was included as  H. gracilein Cairns et al.(2002), following Rees & Vervoort (1987), and as  H. gracilisin the current WoRMS list. When combined with the genus  Hydrodendron(gender: neuter), the specific name must agree in gender and becomes  gracileinstead of  gracilis( Rees & Vervoort 1987). 1915525902 Canada Clarke Rock Rose Spit Pylades Channel 36 37 1 British Columbia holotype