u/Euphoric-Hurry-7816

killer whale 9.5m 15t

Mosasaurus 13m 11t

1. many museums prop open the entire jawbone for easier display, the exhibited specimens are generally much wider than they would be in their normal state.

2.All the muscles responsible for biting in sharks are located in front of the jawbones.The QMD (temporarily translated as quadrato-mandibularis dorsalis) attached to the posterior side of the quadrate cartilage, and the QMV attached to the posterior side of Meckel’s cartilage, have no clear boundary in living specimens and converge at the corner of the mouth.However, anatomically, the QMD slightly wraps downward around the top of the QMV. These two muscles can generate the powerful bite of the megalodon. Based on a 240 kg great white shark’s bite force of 3,200 N, and calculating with a pennation doubling effect to 6,400 N, we can proportionally scale up to a 100-ton megalodon. Its extreme bilateral bite force could reach 350,000 N, and at the 75% position toward the jaw tip, the bite force converts to roughly 35 tons.

3.The only specimen currently with reconstruction value is the holotype of Livyatan MUSM 1676. Its skull is nearly 3 meters long and nearly 2 meters wide. Both Melville’s whale and the megalodon essentially rely on cranial material to estimate their head-to-body ratio, and then use living close relatives as references to infer total body length. At present, we can only determine that the head of Livyatan may have exceeded that of any megalodon. 

Jaw of the megalodon 311000 and the holotype of Livyatan melvillei.

（The tooth rows used for the megalodon is Perez’s tooth row. ）

13.5m～17.5m 40t～70t+（Maximum estimate: 80 tons）

Carcharocles angustidens 12m 17t

Carcharocles angustidens is widely regarded as the direct ancestor of megalodon.

My view is that all claims suggesting Megalodon reached 120 tons or even 150 tons are complete nonsense.

We performed 3D modeling on Shimada’s reconstruction of Megalodon and obtained a result of 96 tons, which is already the maximum estimate.

Then we reconstructed our own version of Megalodon and obtained a result of 103 tons（based on the biggest body plan）, If we use a more conservative reconstruction, Megalodon’s body mass might not even reach 80 tons.

The data doesn’t lie—stop blindly exaggerating Megalodon’s size.

After 3D modeling reconstruction, the body mass of Livyatan melvillei has consistently been underestimated. In fact, the holotype individual is estimated to have reached nearly 80 tons(17.5m), and this may not even represent the largest specimen. Its potential far exceeds that of the top predator of the same period, megalodon, because the largest individuals of the latter may have only reached around 90 tons.

After 3D modeling reconstruction, the body mass of Livyatan melvillei has consistently been underestimated. In fact, the holotype individual is estimated to have reached nearly 80 tons(17.5m), and this may not even represent the largest specimen. Its potential far exceeds that of the top predator of the same period, megalodon, because the largest individuals of the latter may have only reached around 90 tons.

Mosasaurus hoffmannii：

15m17t 14m15t 12m11t

Nanaimoteuthis：

18m8t 14m4t 8m2t

The Two Most Powerful Predators Ever to Roam the Earth

Megalodon 22m 95t

Livyatan（holotype）17.5m 65t

These past few days, I’ve also been reading the various suggestions in the comments, so I made some refinements to the previous reconstruction and proposed several other possibilities as well. Therefore, these are four different reconstructions of the Megalodon.

By combining a reconstruction of the megalodon’s head—based here on the latest study of its dentition—with a comparison to a cranial reconstruction of Livyatan melvillei, it is evident that, although the megalodon’s head was smaller than that of Livyatan melvillei, it possessed a larger bite area, which suggests greater damaging potential. We also compared the body size of the megalodon and Livyatan melvillei (using the maximum estimated size of the holotype specimen of Livyatan melvillei). Although the megalodon was longer, its body mass would not have held a substantial advantage. Taken together, this indicates that the difference between the two was minimal, and in the event of a confrontation, neither could be certain of being able to kill the other.

This reconstruction of Megalodon was modeled with reference to lamnid sharks such as the Shortfin Mako Shark. My interpretation is that it likely did not require an excessively massive, bulky body plan; instead, it may have relied on a more streamlined and agile morphology to dispatch prey with greater speed and efficiency.

So we set it size to be 18 meters in length and 55 tons in weight.

The Megalodon used the estimated body size and the maximum estimated size of Livyatan Holotype （21m Megalodon VS 17.5m Livyatan）