ERMS taxon details
original description
Kramp P.L. (1911). Report on the hydroids collected by the Danmark Expedition at North-East Greenland. <em>Meddelelser om Grønland.</em> 45: 341-396., available online at https://www.biodiversitylibrary.org/page/15388163 page(s): 368, pl. 21 figs 5-6 [details]
original description
(of Halecium undulatum Billard, 1921) Billard, A., 1921. Note sur deux espèces d'hydroïdes du littoral d'Ostende. Annls Soc. r. Zool. Malacol. Belg. 52 : 135-139. page(s): 137, fig. 3 [details] 
basis of record
Schuchert, P., 2005. Taxonomic revision and systematic notes on some Halecium species (Cnidaria, Hydrozoa). Journal of Natural History 39 8: 607-639., available online at https://doi.org/10.1080/00222930400001319 [details] Available for editors 
additional source
Vervoort, W.; Schuchert, P. & van der Land, J. (2000-2007). as a contribution to UNESCO-IOC Register of Marine Organisms. (look up in RoR) [details]
redescription
Schuchert, P. (2001). Hydroids of Greenland and Iceland (Cnidaria, Hydrozoa). Meddelelser om Grønland. <em>Bioscience.</em> 53: 1-184., available online at https://doi.org/10.7146/mogbiosci.v53.142616 page(s): 85, fig. 71A-G, 72A-B [details] 
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