Evidence item

凤凰网 reports different tooth generations across incisors, canines, premolars and molars, calling it the first mammal known with repeated replacement in all four categories. DIRECT_TEXT

Authenticity UNVERIFIED · extraction UNVERIFIED · independence group none (unreviewed) · created seq 24019

Source: 南大科学家联合国内外学者最新发现：1.25亿年前的小型哺乳动物会游泳 · locator {} · excerpt hash sha256:6c836f6d6cec55449dc40ae6478a5d85380001e51db651e5c7246b487bc4e2b4

研究表明，该物种的门齿、犬齿、前臼齿、臼齿保存了不同世代的替换齿，董尖齿兽则是迄今发现的首个在哺乳动物四类牙齿中均可发生牙齿多次替换的哺乳动物。