Argonauta argo   Linnaeus,  1758 (Octopus)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Mollusca
Class: Cephalopoda
Order:Octopoda
Family:Argonautidae

Image copyrights: National Museum & Gallery, Cardiff

Description
Color: The main body of the shell is glistening marble white and the keel and the nodules are brownish black. In live condition the animal is predominantly bluish white in colour with the dorsal arms and webs iridescent white with tints of purple red chromatophores. Eyes are steel blue.

The shell is large, thin and fragile; compressed well with a narrow keel; aperture narrow. The narrow keel bears on either side numerous small and sharp nodules 10 to 12 numbers per 20 mm. The nodules are arranged in pairs in transverse rows on the keel, and each pair is united by a low ridge. The external sides of the shell bear a number of simple bifurcate ribs, most of which originate from the columella and extend to the carinal nodules; some of the outer ribs are separate and form the secondary ribs. The sides of the shell along the edge of the aperture are not turned widely outward. Mantle globular, as wide as long; surface of mantle, head, arms, and web covered with conspicuous, closely-set, large, stellate tubercles; a narrow, tuberculate, fold of skin encircles the lateral surface of the mantle; funnel organ, 4 separate longitudinal pads. The head is smaller than the mantle opening; the eyes are large. Arms are long and subequal in length, the dorsal arms quite thick at their base with large web-hke membranous expansion along the entire length. The arm suckers are biserial.
Sexual dimorphism is marked; males are minute, 15 to 20 mm in total length. In the females the mantle is narrow to broadly oval in shape with blunt posterior end.


Synonym (s)
Argonauta minor Risso, 1854
(Junior synonym)

Common Name (s)
• Greater Argonaut (English)
• Paper Nautilus (English)
Economic Importance and Threats

Ecology
Habitat:  Pelagic

Biogeography


• INDIA

Literature Source(s)
  • Silas, EG; Sarvesan, R and Rao, KS (1985) Octopod resources Cephalopod bionomics, fisheries and resources of the exclusive economic zone of India Bulletin of Central Marine Research Institute CMFRI 37 137-139 Available at - http://eprints.cmfri.org.in/7028/1/Bulletin_No_37.pdf
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Design Museum Available at - http://designmuseum.org/
  • Silas, EG; Sarvesan, R; Rao, KS; Nair, KP and Meiyappan, MM (1985) Identity of common species of cephalopods of India Cephalopod bionomics, fisheries and resources of the exclusive economic zone of India Bulletin of Central Marine Research Institute CMFRI 37 13-37 Available at - http://eprints.cmfri.org.in/7028/1/Bulletin_No_37.pdf

Page last updated on:2011-05-04

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