In the field of zoology, a spadix (/ˈspeɪdɪks/ SPAY-diks; plural spadices /ˈspeɪdɪsiːz/ SPAY-dih-seez, /speɪˈdaɪsiːz/ spay-DY-seez) is a secondary sexual organ found in some cephalopods and hydrozoans. In the genus Nautilus, the spadix is a composite erectile organ in the male located in the oral region which is composed of four highly modified tentacles and which is paired with a somewhat smaller antispadix that is also composed of four tentacles. The spadix is normally a concealed organ but quickly becomes distended upon the animal's death. The exact function of the spadix and antispadix in Nautilus is not yet known.
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Source: "Spadix (zoology)", Wikipedia, Wikimedia Foundation, (2021, December 24th), https://en.wikipedia.org/wiki/Spadix_(zoology).
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- ^ Arthur Giese (2 December 2012). Reproduction of Marine Invertebrates V4: Molluscs: Gastropods and Cephalopods. Elsevier Science. p. 233. ISBN 978-0-323-15305-8.
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