… The fourth change is the change in homodontia, a feature that was also present in reptiles. In the Paleozoic mammal-like reptiles, the shape of each tooth has been differentiated, and four groups (called tooth types) are distinguished from the front: incisors (incisors), canines, premolars (premolars), and molars (molars). This is called heterodontia. … *Some of the terminology that mentions "canine" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 第4は,同じく爬虫類までの特色である同形歯性が変わったことである。古生代の哺乳類様爬虫類にきざしていたことであるが,各歯ごとに形状が分化し,前方から切歯(門歯)incisor,犬歯canine,小臼歯(しようきゆうし)(前臼歯)premolar,大臼歯molarという4種の群(これを歯種という)が区別される。このことを〈異形歯性〉と呼ぶ。… ※「canine」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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