…Of these penises, only those in birds, turtles, and crocodiles are thought to be homologous (of the same origin) to those in mammals; the rest are analogous organs. In lizards and snakes, the hemipenes are pouch-like, with a pair located on the dorsal side of the posterior end of the cloaca, and when contracted, they are stored inside-out in a pocket at the ventral base of the tail. The surface is often equipped with numerous sharp, thorn-like projections, and in pit vipers and rattlesnakes, the tip of each half is further divided into two. … From [Mating]…In lizards and snakes, the male has a pair of copulatory organs in his cloaca. During mating, these turn inside out and protrude outside the body, and are inserted into the female's cloaca. This organ is called the hemipenis. In turtles and crocodiles, the male has a penis in his cloaca, which bulges out from the body and is inserted into the female's cloaca during mating. … *Some of the terminology explanations that mention "hemipenis" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…これらの陰茎のうち哺乳類と相同(同一起源)と思われるものは,鳥類とカメ,ワニなどのものだけで,他は相似器官である。 トカゲ,ヘビのものは半陰茎hemipenisと呼ばれる袋状のもので,総排出腔の後端背側に1対あり,収縮時には尾の腹側基部にあるポケットに裏返しに収められている。表面にはとげ状の鋭い突起を多数そなえることが多く,マムシ,ガラガラヘビなどではそれぞれの先半部がさらに二分している。… 【交尾】より…トカゲ類とヘビ類では,雄は総排出腔内に1対の交尾器官をもっている。これらは交尾のとき裏返しになって胴体外へ突出し,雌の総排出腔内へ挿入されるもので,この器官を半陰茎hemipenisという。カメ類とワニ類の雄は総排出腔内に1個の陰茎を備え,交尾のときこれを体外へ膨出させて雌の総排出腔へ挿入する。… ※「hemipenis」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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