Fraser, 1940a : 578 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 3JB3S Fraser, 1940 a Fraser 1940 [151,607,969,995] Hydrozoa Haleciidae Halecium GBIF Animalia Leptothecata 30 31 Cnidaria species diminutivum     Halecium diminutivum  Fraser, 1940a: 578, pl. 33, figs. 6a, b.     Holotype. USNM 43438: USA, Massachusetts, Nantucket Shoals, on  Sertularellasp., one colony, 1.2 mmhigh, in fair condition, without gonothecae, labelled “ type”; ethanol.   Schizoholotype. BCPM 976-00474-001: USA, Nantucket, on  Sertularellasp., one colony fragment, in fair condition, without gonothecae; slide.    Typelocality. USA, Massachusetts: on Nantucket Shoals, epizoic on  Sertularella( Fraser 1940a).  Current status.Valid.   Remarks.The “ type” of  Halecium diminutivum, as designated by Fraser (1940a), is justifiably listed as a holotypein the online database of the NMNH (USNM 43438). Several other species of hydroids occur with the holotype, including sertulariids, sertularellids, symplectoscyphids, and campanulariids. A slide of the species, from the same sample and on the same substrate (a species of  Sertularella), exists in the Fraser Hydroid Collection at the RBCM (BCPM 976-00474-001). With the species having been based on a single specimen ( Fraser 1940a) from Nantucket Shoals, and with no subsequent records of the species having been reported from the typelocality ( Fraser 1944a, 1947a), we consider the RBCM material to be a fragment of the holotype(i.e., a schizoholotype). This is a miniscule (to 1.2 mmhigh), easily overlooked, and poorly known species, reported only from two locations (the type locality of Nantucket Shoals, and also off Chatham Light) on the coast of Massachusetts, USA ( Fraser 1944a). The gonosome has yet to be described.  Halecium diminutivumis held to be valid in Cairns et al. (2002)and WoRMS. 1915526162 USNM United States of America Nantucket Shoals 30 31 USNM 43438 2 Massachusetts holotype 1915526157 BCPM United States of America Nantucket 30 31 BCPM 976-00474-001 1 1915526104 [199,1290,1250,1275] United States of America Nantucket Shoals 30 31 1 Massachusetts holotype