Praya dubia   (Quoy & Gaimard in de Blainville,  1830) (Hydrozoan)
Organism information awaits expert curation
Class: Hydrozoa

Image copyrights: Steven Haddock

Polygastric phase: A pair of broad, smooth, opposed, huge, elongated, similar nectophore upto 85 mm long 50 mm broad, with one or two reserve buds. Apex obliquely truncated, with nectosac situated on dorsal side, 2/3rd distance from apex; ventral wall extending well below ostium of nectosac. Hydroecium as deep groove extending from apex to below the level of ostium of nectosac, bounded by two lateral flaps; partially closed above by a small gelatinous flap and entirely enclosed below by lateral flaps.Somatocyst with three main branches, thick, opaque white strands seen very clearly and brightly within the transparent mesoglea. Median branch lying in mid longitudinal region; runs anteriorly almost upto apex of nectophore, dividing into two lateral branches extending to lateral edges of nectophore. These curve re-run downwards (posteriorly) terminating on either side at the level of the apex of the nectosac. Lateral branches with four pairs of short, blind diverticula. Posteriorly median branch extends down as far as level of ostium of nectosac. Pedicular canal thin and thread-like.

Nectosac - ΒΌ total length of nectophore, at posterior end on one side of nectophore; with well developed musculature; 12 radial canals arise from pedicular canal and divide two times or more towards distal end to form 50 or more canals near ostium.

Eudoxid phase: Large (20 mm X 10 mm X 4 mm) bract dome shaped, rounded, smooth on dorsal surface, concave with conical-shaped bracteal cavity on ventral side. Bracteal canal system with 4 main branches - dorsal, ventral and left and right hydroecial canals; dorsal canal reaches upto apex of bract; ventral directed backward; left and right hydroecial canals directed forwards on either side of hydroecium; right hydroecial canal not recurved at tip; dorsal bracteal canal not long or recurved; ventral bracteal canal not branched.Two grooves on dorsal surface, one shallow, transverse for opening of dorsal bracteal canal ; deeper vertical groove near hydroecium for passage of tentacle. Gonophores laterally flattened, conical in shape with broad mouth opening. Pedicular canal simple, not branched.

Synonym (s)
Diphyes dubia Quoy & Gaimard 1833
Nectodroma dubia Bigelow 1911
Praya dubia Daniel 1974
Nectocarmen antonioi Alvarino 1983
Prayoides intermedia

Common Name (s)
Economic Importance and Threats

Habitat:  Pelagic


• Bay of Bengal (Lat: 15) (Long: 90) INDIA
• Bay of Bengal (Record: 1962-1965)
• Arabian Sea (Record: 1962-1965)
• Kerala, Off Kochi INDIA (Record: 1962-1965)
• Andaman and Nicobar Islands, Nicobar Islands 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
  • Daniel, R and Daniel, A (1969) Siphonophora collected during the 35th cruise of the R. V. VITYAZ in the eastern part of the Indian Ocean Symposium on Indian Ocean, Part II 571-574 Available at - Library, CAS, Parangipettai
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Biological Sciences - University of California, Santa Barbara Available at -

Page last updated on:2010-06-23

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