Taxonomy and Biogeography of an Australian Subtropical Octopus with Japanese Affinities(Part Two Natural History Study)

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概要

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• A distinctive small octopus (Amphioctopus cf kagoshimensis) is here described from the subtropical waters of eastern Australia. Reports from northern New Zealand are also attributed to this taxon. This small crepuscular animal lives in shallow waters (typically<100m) and feeds primarily on shellfish which it drills to poison and extract prey. The Australasian octopus reported here shows very strong morphological similarities with Amphioctopus kagoshimensis (Ortmann 1888), an octopus which occurs in comparable subtropical latitudes in the northern hemisphere (from southern Japan south to Taiwan). A number of marine species and genera have been reported in the past as having split distributions between subtropical latitudes in both hemispheres. This pattern has been termed "antitropical" or "bipolar", and three main theories have been coined to explain how such a disjunct distribution arose or is maintained. Prior reports of antitropical species are discussed and we suggest that few true bipolar species exist, these primarily being pelagic cool-water species capable of traversing large distances in their temperature-tolerant adult stages. Instead most records are likely to refer to either: 1) deep-water forms which are present in intervening latitudes but not detected due to low sampling effort, or 2) are closely-related forms (sibling taxa) such as the Australasian-Japanese octopus pair treated here. The "relict theory" coined to explain antitropical species may apply to species pairs or complexes marginalised to the boundaries of tropical waters.

• 国立科学博物館の論文

著者

• Kubodera Tsunemi

  Department Of Zoology National Science Museum

• Norman Mark

  Sciences, Museum of Victoria, Melbourne

• Norman Mark

  Sciences Museum Of Victoria Melbourne

関連論文

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• Contamination of Deep-Sea Organisms from Tosa Bay, Japan by Organochlorine and Butyltin Compounds
• Contamination of Deep-Sea Organisms from Suruga Bay, Japan by Organochlorine and Butyltin Compounds
• Marine Molluscs Collected from the Shallow Waters of Hainan Island, South China Sea, by China-Japan Joint Research in 1997
• A Review of Cephalopod Fauna in Chinese-Japanese Subtropical Region
• Taxonomy and Biogeography of an Australian Subtropical Octopus with Japanese Affinities(Part Two Natural History Study)
• Feeding habits of Pacific pomfret Brama japonica in the transition zone of the central North Pacific
• Cephalopod Fauna around Nansei Islands, Southern Japan
• MESOPELAGIC FISHES COLLECTED WITH 10-FOOT IKPT IN THE INDIAN SECTOR OF THE ANTARCTIC OCEAN AND ITS NEIGHBORING WATERS DURING THE JARE-28 CRUISE, 1987 (Eleventh Symposium on Polar Biology)
• Upper Bathyal Cephalopod Fauna in Suruga Bay, Central Japan
• An Outline of "Study on Deep-Sea Fauna and Preservation of Deep-Sea Ecosystem" conducted by the National Science Museum, Tokyo

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