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Spadix (zoology) : ウィキペディア英語版
Spadix (zoology)

In the field of zoology, a spadix (pronounced , ""; plural spadices , "") is a secondary sexual organ found in some cephalopods and hydrozoans. In the ''Nautilus'' genus, 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.
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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