A primitive reptile belonging to the pelycosaurs that lived in Europe and North America from the late Carboniferous to the early Permian. It was about 3 to 3.5 meters long. The spinous processes of the vertebrae extend long upwards, and the skin spreads out like a sail, using them as support bones. Numerous short, finger-like projections protrude irregularly from the bones that support the sail. The sail is 60 to 90 cm high, and looks like a row of girders on the mast of a sailing ship. It is thought that the function of the sail was probably something like a heat dissipation for thermoregulation. It would also have been able to make its body appear larger to intimidate enemies. Based on the characteristics of the skull and teeth, it is believed to have been a herbivorous animal. The skull is short and low compared to the length of the body. All the teeth are the same shape, conical and blunt, and lined up neatly in a single row on the edge of the jawbone. There was also a group of teeth on the palate. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
石炭紀後期からペルム紀前期にかけて,ヨーロッパや北アメリカに生息していた盤竜類に属する原始爬虫類。体長約 3~3.5m。脊椎骨の棘突起が上方に長く伸び,それを支持骨として皮膚が帆をかけたように広がっている。帆の支柱となる骨に,指のような短い突起が多数,横木のように不規則に突き出ている。帆の高さが 60~90cmで,ちょうど帆船のマストに帆桁が並んでいるように見える。帆の機能は,おそらく体温調節のための放熱に類するものではなかったかと考えられている。また体を大きく見せて敵を威嚇することができたであろう。頭骨や歯の特徴から,草食性の動物であったと思われる。胴の長さに比べて頭骨は短く丈が低い。歯はいずれも同形で,円錐状で鈍く,顎骨の縁に 1列にきれいに並んでいた。口蓋にも一群の歯が生えていた。
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