Lychnagalma utricularia   (Claus,  1879) (Hydrozoan)
Organism information awaits expert curation
Class: Hydrozoa

Nectosome: With 6-8 pairs of biserial, alternate nectophore.

Pneumatophore: Small, ovate, with octoradial red-brown pigment at apex; 8 radial septae and annular septum. Lower half lined with greenish air secreting pneumadenia.

Nectophore: Squarish to rectangular in front view. Convex dorsal surface with median rounded ridge fitting into corresponding groove on concave ventral surface of preceding nectophore. Lateral apical corners expanded into small wings, with two pairs of ridges-dorsal and dorso-lateral ridges; dorso-laterals not joining dorsal ridges. Vertical ridge oblique, towards proximal end of nectophore. Ventra-lateral ridges present. Two transverse ridges at distal end of nectophore connect dorsal and dorso-lateral ridges at ostium. With median slightly bilobed lappet. Nectosac squarish, with lateral pouches and neck near ostium.

Siphosome: Longer with dissolved cormidia.

Gastrozooid: With exceptionally long stalk, bearing unique tentacle at base.
Tentacle: With many tentilla all directed upwards. Cnidosac with long red-purple cnidoband forming 7-8 spiral turns enclosed in an ovate involucrum; 4-5 proximal spiral turns lying transversely, middle ones-oblique and distal ones vertical; terminal median ampulla large, oval, vesicular, with oil globule acting as hvdrostatic float; base of ampulla surrounded by eight slender, motile, upright long filaments.

Gonodendra: About two male, 4 female gonodendra between two gastrozooids, at bases of 6-10 palpons. Male gonophores 0.7-0.8 mm long with distinct umbrella; female gonophores larger.

Bract: Flat, scale-like, ovate or triangular with convex dorsal and concave ventral sides. Attached to stem by small peg-like pedicle. Broad distal end with 2 or 3 short pointed teeth.

Synonym (s)
Agalmopsis utricularia Claus, 1879
Lychnagalma utricularia Totton, 1965
Lychnagalma vesicularia Haeckel, 1888
Agalmopsis utricularia Claus, 1879

Common Name (s)
Economic Importance and Threats



• Bay of Bengal (Lat: 15) (Long: 90) INDIA
• Bay of Bengal INDIA (Record: 1962-1965)
• Arabian Sea INDIA (Record: 1962-1965)
• Andaman and Nicobar Islands, Andaman Islands INDIA (Record: 1962-1965)
• INDIA (Record: 1962-1965)
• West Coast 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
  • Zoological Survey of India (Eds) (1991) Animal resources of India (Protozoa to Mammalia) ZSI 1-694 Available at - NCL, Pune
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -

Page last updated on:2010-06-21

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