巨齿鲨 / Megalodon

My enormous shark teeth make your toothbrush look tiny—but I belong on a different evolutionary branch!
我巨大的鲨鱼牙，让你的牙刷显得迷你——不过，我在演化树的另一根枝条上！

Sources
Body dimensions of the extinct giant shark Otodus megalodon: a 2D reconstruction
https://www.nature.com/articles/s41598-020-71387-y
Cenozoic megatooth sharks occupied extremely high trophic positions.
https://www.science.org/doi/10.1126/sciadv.abl6529
Endothermic physiology of extinct megatooth sharks.
https://www.pnas.org/doi/10.1073/pnas.2218153120
Species reference
https://en.wikipedia.org/wiki/Megalodon

Research context
Megalodon illustrates the ecological reach of specialized shark predators. Its size and feeding ecology offer a comparison with marine mammals, rather than a step on the tetrapod or human lineage.