SHARK VS SHARK

Pacific sleeper sharkvsSqualicorax

Length, weight and bite evidence—plus context from a human, city bus and blue whale. Every number below carries its uncertainty with it.

LivingSomniosus pacificus×ExtinctSqualicorax pristodontus
QUICK VERDICT

Pacific sleeper shark is about 1.40× longer by these reference values.

Pacific sleeper shark uses a 7 m upper reference, compared with 5 m for Squalicorax. A clean mass ratio is not shown because at least one weight is not reliably reconstructed.

01

ON THE SAME SCALE

Human. Bus. Whale.
Pick your reference.

RELATIVE LENGTH · 0–24 METERS
APacific sleeper sharkreported near 7 m / 23 ft
BSqualicoraxestimated to about 5 m / 16 ft
REFAdult human1.8 m · about 80 kg

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.

02

THE NUMBERS

Side by side.

MeasurePacific sleeper sharkSqualicorax
Length referencereported near 7 m / 23 ftestimated to about 5 m / 16 ft
Weight referencelarge-animal estimate about 907 kg / 2,000 lbNot reliably reconstructed
Bite forceNo dependable maximum foundUnknownNo defensible estimate usedUnknown
TimeCold North Pacific, often deepabout 85–66 million years ago
DietFishes, squid, marine mammals and carrionFishes, marine reptiles and carrion
03

WHAT THE DATA CAN SAY

Size is not the whole animal.

Length and weight

Pacific sleeper shark is represented by reported near 7 m / 23 ft; Squalicorax by estimated to about 5 m / 16 ft. Large values often depend on indirect or incomplete records. Body length and ecology are reconstructed from incomplete fossil evidence.

Bite evidence

Pacific sleeper shark: No standardized maximum is available. Squalicorax: Bite traces show feeding, not maximum force.

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

Rare encounters make its maximum size less certain than familiar coastal species. Serrated teeth and bite traces show a broad, opportunistic diet.

04

TRACE THE CLAIMS

Sources and limits.

Pacific sleeper sharkAlaska Department of Fish and GameSqualicoraxPaleobiology DatabaseHow we standardize comparisonsRead the methodology →