This rotund, barrel-like belly is on full display in the early herbivorous pelycosaur Cotylorhynchus, whose body dwarfed its tiny head.

这种圆形的桶状腹部在早期食草性盘龙类 Cotylorhynchus 身上得到了充分展示，它的身体使它的小脑袋相形见绌。