Stem arm - Kakeiwan

Japanese: 化茎腕 - かけいわん
Stem arm - Kakeiwan

…A certain arm of the male of a cephalopod mollusk is modified for the purpose of transferring the spermatophore (also called spermatophore) to the female during mating. It is also called the reproductive arm or peduncular arm. In octopods, it is often the right third arm, and in decapoda, it is often the right or left fourth arm (or both). …

*Some of the terminology explanations that mention the "pedicel arm" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…軟体動物頭足類の雄の一定の腕が,交接に際し雌に精莢(せいきよう)spermatophore(精包ともいう)を渡す目的のため変形しているものをいう。生殖腕または化茎腕ともいわれる。八腕形類では右第3腕の場合が多く,十腕形類では右または左(または両側)の第4腕の場合が多い。…

※「化茎腕」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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