Jäderholm, 1903 : 290 Fraser, 1940a : 579 Synthecium crassum Vervoort & Watson, 2003 : 246 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, 1940 a Fraser 1940 [267,519,1278,1304] Hydrozoa Lafoeidae Cryptolaria GBIF Animalia Leptothecata 42 43 Cnidaria species crassa     Synthecium protectum  Jäderholm, 1903: 290, pl. 13, figs. 5, 6.   Diphasia  crassa  Fraser, 1940a: 579, pl. 33, figs. 8a, b.    Synthecium crassum.—  Vervoort & Watson, 2003: 246.     Holotype. USNM 43440: Chile, Reina Adelaida Archipelago, Strait of Magellan, west mouth of straits, R/ V AlbatrossSta.2782, 51°12’S, 74°13’30”W,  472 m, 0  6 February 1888, small beam trawl, one colony, 2.5 cm high, in rather poor condition, without gonophores, labelled “ type”; ethanol.    Typelocality. Chile: southwest coast, 51°12’S, 74°13’30”W,  472 m( Fraser 1940a).  Current status.Invalid.   Remarks.The only known name-bearing typematerial of Diphasia crassa, fixed originally by Fraser (1940a)as the “ type” and constituting a single colony, is justifiably listed as a holotypein collections at the NMNH (USNM 43440). No specimens assigned to the species exist in the Fraser Hydroid Collection at the RBCM. The coordinates of the station are imprecise as they reflect a location on an island.  Fraser (1940a)referred this species, with question, to DiphasiaL. Agassiz, 1862. Poorly known and described from infertile material, it was listed under  SyntheciumAllman, 1872by Vervoort & Watson (2003). Following the suggestion of Horia R. Galea (personal communication, 31 March 2016),  D. crassais regarded here as a synonym of  Synthecium protectum Jäderholm, 1903( typelocality: Cape Valentine, Elephant Island). Of particular note, a distinctive unpaired hydrotheca may occur at the proximal end of each hydrocladium in both  D. crassaand  S. protectum. Jäderholm (1903)also reported that hydrothecae of  S. protectumare partially covered by a flange of the adjoining internode. 1915525969 1888-02-06 USNM V Albatross Sta. Chile 472 -51.2 Strait of Magellan 925 -74.225 42 43 USNM 43440 2 holotype 1915525988 [199,1140,1578,1603] Chile 472 -51.2 Chile 925 -74.225 42 43 1 holotype