肉鳍鱼类支系(包括现生空棘鱼类、肺鱼类及四足动物)的系统发育及地史分布 (IMAGE) Science China Press Caption 扇鳍鱼类冠群及肉鳍鱼类冠群最古老的代表肺鱼形类杨氏鱼(Youngolepis)主要生活于早泥盆世洛赫考夫期(419.2±3.2~410.8±2.8 Ma),肉鳍鱼类干群的斑鳞鱼(Psarolepis)、鬼鱼(Guiyu)则早在志留纪罗德洛世卢德福特期(425.6±0.9 Ma)已有报道。因此, 空棘鱼-扇鳍鱼和肺鱼-四足动物的分异均应发生在罗德洛世-洛赫考夫期间隔内,这意味着两个分歧点的最小估算时间至少应为416.0(419.2-3.2)Ma、最大估算时间约为426.5(425.6+0.9) Ma,即空棘鱼-扇鳍鱼与肺鱼-四足动物的分异均应发生在426.5~416.0 Ma之间。Artwork credit: Brian Choo and Yong Xu. Credit ©《中国科学》杂志社 Usage Restrictions Use with credit. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.