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Johan Lindgren

Johan Lindgren

Senior lecturer

Johan Lindgren

Crypsis in the pelagic realm : evidence from exceptionally preserved fossil fish larvae from the Eocene Stolleklint Clay of Denmark

Author

  • Miriam Heingård
  • Peter Sjövall
  • René L. Sylvestersen
  • Bo P. Schultz
  • Johan Lindgren

Summary, in English

Marine deposits of earliest Eocene age in northern Jutland, Denmark, are renowned for yielding diverse teleost assemblages that have proved central for enhancing our understanding of the early evolution of many extant actinopterygian clades. In this study, we investigate diminutive larval fish fossils from the Stolleklint Clay, Ølst Formation, that retain multiple soft-tissue features preserved as distinct dark-coloured stains. To examine the elemental and molecular composition of these soft parts, we employed a combination of time-of-flight secondary ion mass spectrometry (ToF-SIMS), scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS). Our analyses revealed that the preserved structures contain chemically identifiable eumelanin intimately associated with densely aggregated microbodies that are morphologically consistent with melanosome organelles. Thus, we conclude that the carbonaceous structures represent traces of originally melanized body parts, including the eyes and peritoneum. Comparable pigmentation patterns are seen in many extant teleost larvae that use semi-transparency as a means of camouflage in pelagic environments, to suggest a similar visual appearance of the Stolleklint Clay fish fossils. This in turn suggests that adaptations for concealment and UV-protection had already evolved by the beginning of the Eocene, notably during a time interval characterized by an extreme greenhouse climate, when the global fish fauna become increasingly modern in composition.

Department/s

  • Lithosphere and Biosphere Science

Publishing year

2021

Language

English

Pages

805-815

Publication/Series

Palaeontology

Volume

64

Issue

6

Document type

Journal article

Publisher

Wiley-Blackwell

Topic

  • Geology

Keywords

  • camouflage
  • melanin
  • melanosome
  • pigmentation
  • Teleostei
  • Ølst Formation

Status

Published

Project

  • Exceptional fossil preservation: implications for palaeobiology and taphonomy

ISBN/ISSN/Other

  • ISSN: 0031-0239