Megalodon is about 1.58× longer by these reference values.
Megalodon uses a 15.3 m upper reference, compared with 9.7 m for Ptychodus. A clean mass ratio is not shown because at least one weight is not reliably reconstructed.
ON THE SAME SCALE
Human. Bus. Whale.
Pick your reference.
Length bars use upper comparison values and do not show body depth, tail proportion or typical adult size. A long thresher tail, for example, does not equal whale-shark body mass.
THE NUMBERS
Side by side.
WHAT SETS THEM APART
More than a size contest.
Length and weight
Megalodon is represented by evidence-based upper estimate 14.1–15.3 m / 46–50 ft; Ptychodus by recent reconstructions approach 9.7 m / 32 ft. No complete skeleton exists; 15.3 m is an evidence-based maximum from museum specimens, not a tape measurement. A body outline is rare; length estimates can change with new fossils.
Habitat and diet
Megalodon: Warm and temperate seas worldwide; large marine mammals, turtles and fishes. Ptychodus: Cretaceous shallow seas; hard-shelled prey.
Bite evidence
Megalodon: Finite-element scaling produced a range, not a directly measured bite. Ptychodus: Hard-prey specialization does not justify inventing a force number.
Fossils change the certainty
At least one animal is known from fossils. Fossil length, weight and bite estimates depend on which living analogues and scaling equations researchers choose.
TRACE THE CLAIMS