Halistemma amphytridis   (Lesueur & Petit,  1807) (Hydrozoan)
Organism information awaits expert curation
Class: Hydrozoa

Image copyrights: Hunt, J.C. & D.J. Lindsay

Size: 33 mm long; 25 mm broad.

Nectophores: Longer than broad; number and course of ridges not discernible; with prominent lateral wings and median lappet occurring as two lobes. Nectosac with broad proximal half and narrowing towards ostium. Musculature highly developed. Radial canals thick and clear. Dorsal and ventral radial canals straight without sigmoid curves. Lateral radial canals dip down at proximal surface of nectosac, ascend upwards at lateral corners; descend along lateral surfaces; taking nearly two circular courses once on dorsal and then on ventral side of nectosac and then join ring-canal. Mouth of nectophore broad, wide open; mouth plates broad, flap-like. Pedicular canal short, thick slightly below proximal surface of nectosac.

Bract: 29 mm long, 15 mm broad and 1.2 mm thick. Uniformly thick except thicker at proximal middle region. Leaf-like with asymmetrical shape. Three blunt teeth at distal end and two small ones on lateral edges. Bracteal canal thick, at centre, extending up to tip of bract.

Synonym (s)
Stephanomia amphytridis Lesueur & Petit, 1807
Stephanomia amphytridis Bigelow, 1911

Common Name (s)
Economic Importance and Threats

Habitat:  Pelagic


• Arabian Sea INDIA (Record: 1962-1965)
• INDIA (Record: 1962-1965)

Literature Source(s)
  • Daniel, R (1985) Fauna of India and the adjacent countries (Coelenterata: Hydrozoa: Siphonophora) ZSI 440 pp Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Sealifebase Available at - http://www.sealifebase.org/
  • Hunt, JC & DJ Lindsay (1999) List of taxa recorded from the Sagami Bay, Japan, using the submersibles Shinkai 2000 and the Dolphin-3K Methodology for creating an observational database of midwater fauna using submersibles: Results from Sagami Bay, Japan Plankton Biology and Ecology 46(1) 75-87 Available at - http://www.jamstec.go.jp/jamstec/MESOPELAGIC/SagamiTaxaList.html

Page last updated on:2010-06-18

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