Rosacea cymbiformis   (delle Chiaje,  1830) (Hydrozoan)
Organism information awaits expert curation
Class: Hydrozoa

Image copyrights: Woods Hole Oceanographic Institution

Size: Nectophores up to 17.5 mm in height.

The asexual polygastric stage is composed of 2 simple rounded nectophores attached ventrally. One nectophore partially surrounds the other. The jelly is very thick giving buoyancy to the animal. The inner cavity, the nectosac, which is used in propulsion, is small, so the animal is slow swimming. The nectosac is less than two-fifths the height of the nectophore. The nectophores have a shallow furrow called the hydroecium, extending the length of the ventral surface, inside which the siphosomal stem is attached, so the region of the stem where budding of the cormidia takes place is protected from damage. The stem can be drawn up into the hydroecium, both for protection and to streamline the body during swimming. Alongside the hydroecium runs the somatocyst.

The polygastric stage buds off and releases the sexual cormidia, which develop into the eudoxid stage.

Synonym (s)
Physalia cymbiformis Delle Chiage, 1841
Praya cymbiformis Bigelow, 1911
Rosacea cymbiformis Daniel, 1974
Neorosacea cymbiformis (Delle Chiaje, 1822)
Physalia cymbiformis delle Chiaje, 1830

Common Name (s)
Economic Importance and Threats

Habitat:  Pelagic, Coastal


• Bay of Bengal (Lat: 15) (Long: 90) INDIA
• Bay of Bengal INDIA (Record: 1962-1965)
• Arabian Sea INDIA (Record: 1962-1965)
• West Coast INDIA (Record: 1962-1965)
• Andaman and Nicobar Islands, Andaman Islands INDIA (Record: 1962-1965)
• West Coast INDIA
• Lakshadweep Sea INDIA

Literature Source(s)
  • Daniel, R (1985) Fauna of India and the adjacent countries (Coelenterata: Hydrozoa: Siphonophora) ZSI 440 pp Available at - NIO, Goa
  • Conway, DVP; White, RG; Hugues-Dit-Ciles, J; Gallienne, CP and Robins, DB (2003) Guide to the coastal and surface zooplankton of the south western Indian Ocean Occasional publication no 15 Marine Biological Association of the United Kingdom Occasional Publication of the Marine Biological association of the United Kingdom 354 pp Available at -
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Sealifebase Available at -
  • Oceanus Available at -
  • Rengarajan, K (1975) Distribution of siphonophores along the west coast of India and the Laccadive sea Journal of the marine biological association of India The marine biological association of India 17(1) 56-72 Available at - NIO, Goa

Page last updated on:2011-06-06

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