Rhizorhagium roseum M. Sars 1874

• Main Author: Calder, Dale R.
• Format: Text
• Language: unknown
• Published: Zenodo 2012
• Subjects: Biodiversity; Taxonomy; Animalia; Cnidaria; Hydrozoa; Anthoathecata; Bougainvilliidae; Rhizorhagium; Rhizorhagium roseum; Arctic; Canada; Pacific; Norway; Rowe; Foxe Basin; Christiania; North Atlantic; Subarctic; Alaska
• Online Access: https://dx.doi.org/10.5281/zenodo.5248508; https://zenodo.org/record/5248508

Rhizorhagium roseum M. Sars, in G.O. Sars, 1874 Fig. 12 Rhizorhagium roseum M. Sars, in G.O. Sars, 1874: 129.— Rees & Rowe, 1969: 10. Perigonimus roseus .— Lönnberg, 1902: 173.— Jäderholm, 1909: 46, pl. 3, fig. 7.— Jägerskiöld, 1971: 64. Type locality. Norway: Mangerfjord, Bognestrømmen, 20 fm (37 m) (Rees 1956b: 114). Museum material. Kosterhavet, 58°53.093’N, 11°05.668’E, 20–30 m, 09.ix.2010, biological dredge, R / V Nereus , two colonies, up to 5 mm high, on stems of Tubularia indivisa and Lafoea gracillima , without gonophores, ROMIZ B3909. Remarks. Gonophores were lacking in studied material, but the trophosome of Rhizorhagium roseum M. Sars, in G.O. Sars, 1874, with its stolonal habit, long hydrocaulus, thin pseudohydrotheca, single tentacular whorl, and nipple-shaped hypostome, as well as its reddish to pinkish hydranths that bend over when disturbed, is distinctive among hydroids in the biogeographic region. A detailed account of this small species, from boreal and subarctic waters on both sides of the Atlantic Ocean, has recently been given by Schuchert (2007). Rees (1956b) examined type material of Rhizorhagium roseum and concluded from the original label that it was from “Bongnestrømmen” (Bognestrømmen) in the Mangerfjord, Norway. In addition to its occurrence on the west coast of Sweden (e.g., Jäderholm 1909, as Perigonimus roseus ), R. roseum has been reported from the Oslofjord, Norway (Christiansen 1972). Reported distribution. West coast of Sweden.—Kosterfjord to Gullmarfjord (Rees & Rowe 1969). Elsewhere.—North Atlantic from the Barents and White seas to western Scotland in Europe (Schuchert 2007), and from northern Foxe Basin in the Canadian Arctic to Buzzard’s Bay, Massachusetts, in eastern North America (Calder 2004); eastern North Pacific from Alaska to southern Vancouver Island (Fraser 1944, as Garveia groenlandica Brinckmann-Voss 1996). : Published as part of Calder, Dale R., 2012, On a collection of hydroids (Cnidaria, Hydrozoa, Hydroidolina) from the west coast of Sweden, with a checklist of species from the region 3171, pp. 1-77 in Zootaxa 3171 (1) on page 14, DOI: 10.11646/zootaxa.3171.1.1, http://zenodo.org/record/5247704 : {"references": ["Sars, G. O. (1874) Bidrag til kundskaben om norges hydroider. Forhandlinger i Videnskabs-Selskabet i Christiania, 1873, 91 - 150.", "Rees, W. J. & Rowe, M. (1969) Hydroids of the Swedish west coast. Acta Regiae Societatis Scientiarum et Litterarum Gothobergensis, Zoologica, 3: 1 - 23.", "Lonnberg, E. (1902) Nagra smarre iakttagelser rorande faunan i Bohuslan i mars manad 1902. Ofversigt af Kongliga Vetenskaps-Akademiens Forhandlingar, 59, 169 - 174.", "Jaderholm, E. (1909) Northern and Arctic invertebrates in the collection of the Swedish State Museum (Riksmuseum). IV. Hydroiden. Kungliga Svenska Vetenskapsakademiens Handlingar, ny foljd, 45 (1), 1 - 124.", "Jagerskiold, L. A. (1971) A survey of the marine benthonic macro-fauna along the Swedish west coast 1921 - 1938. Acta Regiae Societatis Scientiarum et Litterarum Gothobergensis, Zoologica, 6, 1 - 146.", "Rees, W. J. (1956 b) A revision of some northern gymnoblastic hydroids in the Zoological Museum, Oslo. Nytt Magasin for Zoologi, 4, 109 - 120.", "Schuchert, P. (2007) The European athecate hydroids and their medusae (Hydrozoa, Cnidaria): Filifera Part 2. Revue Suisse de Zoologie, 114, 195 - 396.", "Christiansen, B. O. (1972) The hydroid fauna of the Oslo Fiord in Norway. Norwegian Journal of Zoology, 20, 279 - 310.", "Calder, D. R. (2004) Subtidal hydroids (Cnidaria) of Northumberland Strait, Atlantic Canada, with observations on their life cycles and distributions. Canadian Field-Naturalist, 117, 555 - 564. (Although dated 2003, this article did not appear until 2004).", "Fraser, C. M. (1944) Hydroids of the Atlantic coast of North America. University of Toronto Press, Toronto, 451 pp.", "Brinckmann-Voss, A. (1996) Seasonality of hydroids (Hydrozoa, Cnidaria) from an intertidal pool and adjacent subtidal habitats at Race Rocks, off Vancouver Island, Canada. Scientia Marina, 60, 89 - 97."]}