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Updated: Sep 10, 2025

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
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Cephalopod body size and macroecology through deep time.

Christian Klug1, Dirk Fuchs2, Alexander Pohle3

  • 1Paläontologisches Institut und Museum, Karl-Schmid-Strasse 4, 8006, Zürich, Switzerland. chklug@pim.uzh.ch.

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Summary

Cephalopod body size has fluctuated over 500 million years, with different groups evolving distinct maximum sizes and responses to mass extinctions. Most cephalopod lineages, excluding nautilids, evolved marine megafauna exceeding one meter.

Keywords:
AmmonoidaGigantismMacroecologyNautilidaNeocoleoideaPhanerozoic

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Area of Science:

  • Paleontology
  • Marine Biology
  • Evolutionary Biology

Background:

  • Cephalopods are ancient marine predators crucial to ecosystem regulation.
  • Understanding their evolutionary body size trends provides insights into marine ecosystem dynamics.

Purpose of the Study:

  • To reconstruct and analyze the long-term fluctuations of cephalopod body size from the Cambrian to the present.
  • To compare the evolutionary trajectories and mass extinction responses across major cephalopod groups.

Main Methods:

  • Determined maximum body volumes for various cephalopod species using diverse proxies for inter-group comparability.
  • Separately analyzed Cephalopoda with orthoconic conchs, Nautilida, Ammonoida, and Neocoleoida.

Main Results:

  • Long-term body size trajectories varied significantly among the examined cephalopod groups.
  • All groups, except nautilids, evolved species exceeding one meter in size, becoming part of the marine megafauna.
  • Nautilids and orthocones had a volume threshold around 100 liters, while ammonoids and neocoleoids reached up to 500 liters.

Conclusions:

  • Cephalopod body size evolution is diverse, with distinct group-specific trends and responses to environmental changes like mass extinctions.
  • The study highlights the significant ecological role of cephalopods, particularly the evolution of marine megafauna within this class.