Enneagonum hyalinum   Quoy & Gaimard,  1827 (Hydrozoan)
Organism information awaits expert curation
Class: Hydrozoa

Polygastric phase: Anterior nectophore: Size: Length 8.75 mm; breadth 9.75 mm; Somatocyst 3.5 mm; Hydroecium 4.75 mm; netosac 4.5 mm.

Characteristically pyramidal in shape with flared out facets and prominent pointed angles. A median dorsal ridge present. Beneath and between these apico-dorsal facets lie a triangular basal facet, two apico-lateral facets and two baso-lateral facets. Somatocyst elongate with a constriction at apex and a short stalk. Hydroecium lying below somatocyst, deep, with 4 serrated teeth around opening. Nectosac lying alongside somatocyst and hydroecium, with arched lateral radial canals and blind apical diverticula.
Posterior nectophore: Not developed.

Eudoxid phase: Bract: perfectly cuboidal in shape with 5 slightly concave facets (apical, dorsal, ventral and two lateral). Basal part with broad slit-like opening of conical bracteal cavity. Phyllocyst without descending branch, with a broad slightly bilobed base and a short knob-like apical end.

Gonophore: Length of 6.67 mm with large blunt, conical apophysis. Separated from basal half by a prominent "apical cross-ridge". Dorsal ridge vestigeal, and incomplete; lateral ridges long, displaced to dorsal side, end in teeth at base, with semicircular serrated lappet; ventral ridges complete ending in longer teeth at base. Characteristic hook-like tooth present at junction between right ventral ridge and "apical cross-ridge".

Synonym (s)
Enneagonum hyalinum Daniel, 1974
Enneagonum hyalinum Sears, 1953
Enneagonum hyalinum Quoy & Gaimard, 1827
Enneagonum searsae Alvarino, 1968

Common Name (s)
Economic Importance and Threats

Habitat:  Pelagic, Coastal


• Bay of Bengal (Lat: 15) (Long: 90) INDIA
• Arabian Sea INDIA (Record: 1962-1965)
• Bay of Bengal INDIA (Record: 1962-1965)
• INDIA (Record: 1962-1965)
• Andaman and Nicobar Islands, Andaman Islands INDIA (Record: 1962-1965)
• Tamil Nadu, Chennai Coast INDIA
• Lakshadweep (Lat: 9.16) (Long: 76.33) INDIA (Record: 01/1962-12/1963)
• Westcoast (Lat: 18.7) (Long: 70.1) INDIA (Record: 01/1962-12/1963)
• Westcoast (Lat: 20) (Long: 69.5) INDIA (Record: 01/1962-12/1963)
• Westcoast (Lat: 20.93) (Long: 68.83) INDIA (Record: 01/1962-12/1963)
• Westcoast (Lat: 20.86) (Long: 70.35) INDIA (Record: 01/1962-12/1963)
• Westcoast (Lat: 20.48) (Long: 70.06) INDIA (Record: 01/1962-12/1963)
• Westcoast (Lat: 20.33) (Long: 70.51) INDIA (Record: 01/1962-12/1963)
• Westcoast (Lat: 18.5) (Long: 70.43) INDIA (Record: 01/1962-12/1963)
• Westcoast (Lat: 18.5) (Long: 70.23) INDIA (Record: 01/1962-12/1963)
• Westcoast (Lat: 17) (Long: 71.5) INDIA (Record: 01/1962-12/1963)
• Lakshadweep (Lat: 10.95) (Long: 75.11) INDIA (Record: 16/11/1963)
• Westcoast (Lat: 11.2) (Long: 75.65) INDIA (Record: 01/1962-12/1963)
• Lakshadweep (Lat: 9.68) (Long: 75.16) INDIA (Record: 17/11/1963)
• Lakshadweep (Lat: 9.81) (Long: 75.66) INDIA (Record: 18/11/1963)
• Westcoast (Lat: 15.45) (Long: 71.36) INDIA (Record: 08/12/1963)
• Lakshadweep (Lat: 9.83) (Long: 75) INDIA (Record: 19/12/1963)
• Lakshadweep (Lat: 9.51) (Long: 74.31) INDIA (Record: 19/12/1963)
• Lakshadweep (Lat: 9.5) (Long: 73.83) INDIA (Record: 19/12/1963)
• Lakshadweep Sea INDIA
• South West Coast INDIA
• West Coast INDIA
• Bay of Bengal INDIA

Literature Source(s)
  • Daniel, R (1985) Fauna of India and the adjacent countries (Coelenterata: Hydrozoa: Siphonophora) ZSI 440 pp Available at - NIO, Goa
  • Hussain, SM Brief report on biodiversity in the coastal areas of Pakistan p 113
  • 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 - http://www.marinespecies.org
  • Sealifebase Available at - http://www.sealifebase.org/
  • Dr. Ramesh, R; Dr. Nammalwar, P and Dr. Gowri, VS (2008) Database on coastal information of Tamil Nadu Report Submitted to Environmental Information System (ENVIS) Centre, Department of Environment, Government of Tamil Nadu Institute for Ocean Management, Anna University, Chennai, Tamil Nadu. Available at - http://tnenvis.nic.in/PDF/coastal%20data.pdf
  • Rengarajan, K (1973) Siphonophores obtained during the cruises of R. V. Varuna from the west coast of India and the Laccadive Sea Journal of the Marine Biological Association of India The Marine Biological Association of India, Cochin, India 15(1) 125-129 Available at - http://eprints.cmfri.org.in/1580/1/Rao_125-259.pdf
  • Rengarajan, K (1983) Quantitative and seasonal abundance of siphonophores along the southwest coast of India and the Laccadive sea Journal of marine biological association of India The marine biological association of India 25(1&2) 17-40 Available at - NIO, Goa
  • Daniel, R and Daniel, A (1963) On the siphonophores of the Bay of Bengal I.Madras coast2( Journal of the Marine Biological Association of India The marine biological association of India 5(2) 185-220 Available at - NIO, Goa
  • 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
  • Jitlang, I; Pattarajinda, S; Mishra, R and Wongrat, L (2007) Composition, Abundance and Distribution of Zooplankton in the Bay of Bengal The Ecosystem-Based Fishery Management in the Bay of Bengal 65-92 Available at - http://map.seafdec.org/downloads/BIMSTEC/010-Zooplankton-Issaporn.pdf

Page last updated on:2011-06-23

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