…However, these aquatic species are not very dangerous in the water, where there are few natural predators, and their plastrons have degenerated to become smaller and lighter. The American Musk Turtle Sternotherus and the Mud Turtle Kinosternon are also species with small plastrons, but instead have developed limbs and are excellent swimmers. They can also lift their hinged plastrons to close the gaps in the shell tightly. … *Some of the terminology that mentions "Kinosternon" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…しかし,これら水生種にとって天敵の少ない水中はあまり危険でなく,腹甲も退化して小さく軽くなっている。アメリカ産ニオイガメ類Sternotherusやドロガメ類Kinosternonも腹甲の小さい仲間で,代りに四肢が発達して遊泳力が優れている。そしてちょうつがい状の腹甲をもち上げて,甲の隙間をぴったり閉じることもできる。… ※「Kinosternon」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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