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Fossil insects are valuable indicators of the evolutionary history of the clades to which they belong. According to their state of preservation, fossil insects are often partially described for key morphological characters, such as forewing venation in crickets (  Orthoptera  ,   Grylloidea  ). In parallel, the use of 3D microtomography is increasingly becoming common for studying some fossils, which allowed here the precise reconstruction and interpretation of the venation pattern in the smallest known cricket with a stridulatory apparatus, †   Picogryllus   carentonensis   , found in opaque amber. The 3D reconstructions have revealed the general structure of the venation of the forewing and have enabled the identification of all its veins and cells, validating its similarity with that of extant crickets. Putative homologies are established according to previous studies, and some particularities are observed, such as the presence of two crossveins in the mirror, a rare feature in extant crickets that is discussed in the frame of cricket venation evolution. These findings highlight the importance of 3D microtomography as a powerful tool for examining fossil insects and also provide crucial information for taxonomic identification and evolutionary studies, offering a validated morphological basis for future phylogenetic analyses incorporating fossils.

fossil record

﻿First 3D reconstruction of a forewing of a fossil   Orthoptera  : Interpreting the venation pattern in the smallest known cricket with a stridulatory apparatus, †   Picogryllus   carentonensis    (  Orthoptera  ,   Grylloidea  ,   Oecanthidae  )

﻿First 3D reconstruction of a forewing of a fossil Orthoptera : Interpreting the venation pattern in the smallest known cricket with a stridulatory apparatus, † Picogryllus carentonensis ( Orthoptera , Grylloidea , Oecanthidae )

First 3D reconstruction of a forewing of a fossil Orthoptera : Interpreting the venation pattern in the smallest known cricket with a stridulatory apparatus, † Picogryllus carentonensis ( Orthoptera , Grylloidea , Oecanthidae )