Molluscan ResearchISSN 1323-5818
 An international journal of the Malacological Society of Australasia published by Magnolia Press

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Molluscan Research 25(3): 113-128; published 20 December 2005
Copyright © The Malacological Society of Australasia

Description of a new species of the genus Amphioctopus (Mollusca: Octopodidae) from the Hawai'ian Islands

1 Department of Integrative Biology, 3060 Valley Life Sciences, BLDG #3140, University of California, Berkeley, CA 94720- 3140 USA.
2 Department of Invertebrate Zoology, Santa Barbara Museum of Natural History, 2559 Puesta del Sol Road, Santa Barbara, CA 93105-2936USA. E-mail:


Amphioctopus arenicola is a new species of octopus that lives in shallow coastal waters off the Hawai'ian Islands. The species is medium sized (ML to 100 mm); sucker counts range from 160-210 on normal arms and approximately 100 on hectocotylized arms of males; gill counts range from 9?1 lamellae per demibranch; copulatory organs are small, 2.5-3.5% of hectocotylized arm lengths; eggs are small (2-3 mm); and hatchlings planktonic. Amphioctopus arenicola shares a number of characteristics with several non-ocellate tropical Pacific members of the genus, namely, A. aegina (Gray, 1849), A. kagoshimensis (Ortman, 1888), and A. marginatus (Taki, 1964). It can be distinguished from these species based on body size, sucker counts, configuration of the male terminal organ, spermatophore size and number, and geographic distribution. Amphioctopus arenicola typically lives on sandy substrates in depths ranging from 1-80 m

Key words: Octopus, taxonomy, short-armed sand octopus, Amphioctopus arenicola, Octopus aegina species group

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