a large fossil reptile of the late Carboniferous and Permian periods, typically having a line of long bony spines along the back supporting a sail-like crest 盘龙
Order Pelycosauria, subclass Synapsida: several families and genera, including Dimetrodon and Edaphosaurus 盘龙目,下孔亚纲:数科,数属,包括异齿龙属和基龙属