Ptychodus is about 1.52× longer by these reference values.
Ptychodus uses a 9.7 m upper reference, compared with 6.4 m for Greenland shark. 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 THE DATA CAN SAY
Size is not the whole animal.
Length and weight
Greenland shark is represented by confirmed to about 6.4 m / 21 ft; Ptychodus by recent reconstructions approach 9.7 m / 32 ft. Age and upper mass involve uncertainty; length is better documented. A body outline is rare; length estimates can change with new fossils.
Bite evidence
Greenland shark: TuffShark found no defensible species-level bite-force estimate to display. Ptychodus: Hard-prey specialization does not justify inventing a force number.
Living versus extinct
At least one animal is known from fossils. Fossil length, weight and bite estimates depend on which living analogues and scaling equations researchers choose.
Ecology changes the matchup
The age estimate is extraordinary; a dependable bite-force figure is not available. Flattened crushing teeth—not knife-like teeth—defined this huge shark.
TRACE THE CLAIMS