A general term for mammals belonging to the order Sirenia. These animals flourished in the past, with only four extant species, one dugong and three manatees. Their bodies are spindle-shaped, with flipper-like forelimbs and hind limbs that have degenerated and are not visible. They have a horizontal tail fin at the end of their tail. Their body color is lead gray or pale purple gray. They are the only herbivorous marine mammals, and their salivary glands do not open into the part of their mouth that is washed by water. Their stomachs and duodenums have a special structure, and their large intestines grow longer as they grow, reaching nearly twice the length of their small intestines in adults. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
カイギュウ目Sireniaに属する哺乳類の総称。現在よりも過去に繁栄した動物で,現生種はジュゴン1種とマナティー3種の計4種だけである。体は紡錘形で,前肢はひれ状,後足は退化して見えない。尾部先端に水平な尾びれがある。体色は鉛灰色または淡紫灰色である。唯一の草食海獣で,唾液腺は口の中で水に洗われる部分には開口していない。胃から十二指腸にかけては特別な構造をしており,大腸は成長に伴って長くなり,成獣では小腸の2倍近くもある。
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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