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Prehistoric Life

How big was Parapuzosia seppenradensis?

Parapuzosia seppenradensis was about 2.5 m (8 ft 2 in) across.

What is measured: giant ammonite, shell diameter

Parapuzosia seppenradensis (2.5 m) drawn to scale beside a doorway (2 m) and a 20-foot shipping container (6.06 m)
Drawn to scale, from left to right: Doorway (2 m), Parapuzosia seppenradensis (2.5 m) and Shipping container (20 ft) (6.06 m).

Compare

How big is that, really?

  • About 1.3× the height of a doorway
  • About 1.5× the height of an adult person
  • About 2 would fit end to end along a 20-foot shipping container
  • About 4 would fit end to end along a city bus
  • About 6.6× the height of a bowling pin

Learn

Facts about Parapuzosia seppenradensis

Parapuzosia seppenradensis was among the largest known ammonites, with a coiled shell more than two metres across.

Source: Natural History Museum, London — Ammonites; Encyclopaedia Britannica — Ammonite

Prehistoric Life

NameSizeCompared with Parapuzosia seppenradensis
Megaloceros giganteus2.1 m (6 ft 11 in)0.84×
Entelodon magnus2.1 m (6 ft 11 in)0.84×
Daeodon shoshonensis2.1 m (6 ft 11 in)0.84×
Triceratops horridus2.4 m (7 ft 10 in)0.96×
Parapuzosia seppenradensis2.5 m (8 ft 2 in)this page
Pterodaustro guinazui2.5 m (8 ft 2 in)same size
Maiasaura peeblesorum2.5 m (8 ft 2 in)same size
Arthropleura armata2.6 m (8 ft 6 in)1×
Mammut americanum2.9 m (9 ft 6 in)1.2×
Hieraaetus moorei3 m (9 ft 10 in)1.2×

Test your sense of scale

Which is bigger: Parapuzosia seppenradensis or Hieraaetus moorei?

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