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Related Experiment Video

Updated: May 19, 2026

Light Sheet-based Fluorescence Microscopy of Living or Fixed and Stained Tribolium castaneum Embryos

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A complete insect from the Late Devonian period.

Romain Garrouste¹, Gaël Clément, Patricia Nel

¹UMR CNRS 7205, CP 50, Entomologie, Muséum national d'Histoire naturelle, 45 rue Buffon, F-75005 Paris, France. garroust@mnhn.fr

|August 4, 2012

Summary

This summary is machine-generated.

A complete Late Devonian insect fossil reveals early hexapod diversification. This finding bridges a significant gap in the fossil record, suggesting Pterygota diversified before and during Romer's gap.

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Area of Science:

Paleontology
Evolutionary Biology
Entomology

Background:

Arthropod and vertebrate diversification occurred in two phases: Silurian-Frasnian and Late Carboniferous.
Romer's gap (360-345 Myr ago) and the arthropod gap (385-325 Myr ago) represent periods of low fossil diversity, potentially due to preservation bias.
The early fossil record of hexapods (insects and their relatives) in the Early-Middle Devonian is sparse and consists of fragmentary remains.

Observation:

A complete insect fossil from the Late Devonian period has been discovered.
The insect possesses 'orthopteroid' mandibles indicative of an omnivorous diet.
This discovery significantly narrows the 45-million-year gap in the Hexapoda fossil record.

Findings:

The fossil provides the first complete evidence of a terrestrial insect from the Late Devonian.
It supports a Devonian phase of hexapod diversification, paralleling that of vertebrates.
The findings suggest that winged insects (Pterygota) diversified prior to and during Romer's gap.

Implications:

This discovery challenges previous assumptions about insect evolution timing.
It highlights the importance of the Devonian period for early terrestrial ecosystem development.
Provides crucial data for understanding the evolutionary history of insects and terrestrial life.