The first extinct species of <i>Acritus</i> LeConte, 1853 (Histeridae: Abraeinae) from Eocene Baltic amber: a microscopic beetle inclusion studied with X-ray micro-computed tomography

Alekseev, Vitalii I.; Bukejs, Andris

doi:https://doi.org/10.5194/fr-24-223-2021

Articles | Volume 24, issue 2

https://doi.org/10.5194/fr-24-223-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/fr-24-223-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 24, issue 2

Research article

|

08 Jul 2021

Research article |

| 08 Jul 2021

The first extinct species of Acritus LeConte, 1853 (Histeridae: Abraeinae) from Eocene Baltic amber: a microscopic beetle inclusion studied with X-ray micro-computed tomography

Vitalii I. Alekseev and Andris Bukejs

Video supplement

Acritus (s. str.) sutirca, holotype, 5541 [MAIG], X-ray micro-CT volume rendering of the habitus A. Bukejs and V. I. Alekseev https://doi.org/10.5446/52938

Acritus (s. str.) sutirca, holotype, 5541 [MAIG], X-ray micro-CT volume rendering of the antennae A. Bukejs and V. I. Alekseev https://doi.org/10.5446/52939

Acritus (s. str.) sutirca, holotype, 5541 [MAIG], X-ray micro-CT volume rendering of the aedeagus A. Bukejs and V. I. Alekseev https://doi.org/10.5446/52940

Short summary

A new micro-histerid species is described and illustrated from Eocene Baltic amber. As the first extinct member of the subfamily Abraeinae (Histeridae) and the smallest known fossil histerid specimen, this material was examined using a combination of light microscopy and X-ray micro-computed tomography (μCT). Internal features of the abdomen are well preserved, allowing us to study sclerotized parts of the aedeagus and illustrate these structures in detail.