Apolemia uvaria   (Lesueur,  1815) (Hydrozoan)
Organism information awaits expert curation
Class: Hydrozoa

Image copyrights: L. & L. Langstroth

Size: Grows up to 20 meters or more.

Pneumatophore: Very small, usually hidden by nectophores.

Nectosome: Nectosome short, bearing about 2-6 pairs of nectophores.

Nectophore: 13-20 mm in diameter, bi-serially arranged. Axial side of nectophore deeply hollowed out, the lateral wings unite ventrally to form a keel and wide apart above embracing lower part of nectophore situated just above it. Youngest nectophore overlap immature ones above it and float. Muscular lamella broad. Pedicular canal short and obscure. Dorsal radial canal 'U' shaped, ventral canal short lying close to muscular lamella; lateral canals with 'S' shaped bends bearing short blind irregular branches. Unique tuft of 5 or 6 nectosomal tentacles at base of muscular lamellae of each nectophore.

Siphosome: Huge – 20 m long or more. With hundreds of cormidia, older ones detach, becoming free swimming.

Cormidia: Ordinate cormidia, about 5 cm apart; with one or two gastrozooids with filiform tentacles; some palpons long, vermiform, with simple tentacles; some palpons short, stiff, with red-brown pigmented granules.

Bracts: Numerous, scaphoid in shape, with convex dorsal surface. Bracteal canal lying close to concave ventral side.
Opaque patches of nematocysts on bracts, palpons, gastrozooids and nectophores.

Gonophores: In bunches at distal part of stem. Probably dioecious. Highly reduced, styloid. Female gynophore with laterally displaced manubrium, lying wholly within two layered ectoderm. Radial canals suppressed. Single ovum (monovon) with plenty of yolk.

Synonym (s)
Stephanomia uvaria Lamarck, 1816
Dicymba diphyopsis Haeckel, 1888
Apolemia uvaria Bigelow, 1911
Apolemia uvaria Totton, 1965

Common Name (s)
Economic Importance and Threats

Habitat:  Pelagic


• Arabian Sea 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/
  • CalPhotos Available at - http://calphotos.berkeley.edu/

Page last updated on:2010-06-09

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