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The earliest known holometabolous insects.

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Fossil discoveries reveal unexpected Pennsylvanian-era insect diversity, showing Eumetabola diversification during ancient glaciations. These early insects were small, preceding later radiations after Permian extinctions.

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Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Insect Systematics

Background:

  • The Eumetabola (Endopterygota and Paraneoptera) represent a major clade contributing significantly to animal biodiversity.
  • Understanding the palaeoecological factors influencing their emergence and diversification is crucial.
  • Previous molecular phylogenies proposed diverse dates for Holometabola and Hemiptera origins, with an incomplete Pennsylvanian fossil record.

Purpose of the Study:

  • To describe newly discovered Pennsylvanian-period fossils of early eumetabolan insects.
  • To reveal the breadth of early insect diversity during the Moscovian and Gzhelian ages.
  • To provide new data for understanding eumetabolan evolutionary history and diversification events.

Main Methods:

  • Description and analysis of five newly discovered fossils: a stem coleopterid, a holometabolous larva, a stem hymenopterid, and early Hemiptera and Psocodea.
  • Dating of fossils to the Moscovian and Gzhelian ages of the Pennsylvanian period.
  • Comparison of fossil evidence with existing molecular phylogenetic hypotheses and palaeoenvironmental data.

Main Results:

  • Discovery of fossils representing a penecontemporaneous breadth of early eumetabolan insects from the Moscovian age.
  • Evidence for Eumetabola diversification episodes during the Bashkirian-Moscovian and Kasimovian-Gzhelian ages, potentially linked to glacial drying events.
  • These early species were small, existing before the major radiation of crown groups post-Permian extinctions.

Conclusions:

  • The discovered fossils support hypotheses of earlier clade divergence than previously suggested by the fossil record.
  • Pennsylvanian-period glaciations and associated environmental changes may have driven early eumetabolan diversification.
  • The major radiation of Eumetabola occurred after the end-Permian mass extinctions, leading to the establishment of modern insect groups.