Articles | Volume 24, issue 2
https://doi.org/10.5194/fr-24-223-2021
https://doi.org/10.5194/fr-24-223-2021
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

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Cited articles

Alekseev, V. I.: The beetles (Insecta: Coleoptera) of Baltic amber: the checklist of described species and preliminary analysis of biodiversity, Zool. Ecol., 23, 5–12, https://doi.org/10.1080/21658005.2013.769717, 2013. 
Alekseev, V. I.: Description of two clown beetles (Coleoptera: Staphyliniformia: Hydrophiloidea: Histeridae) from Baltic amber (Cenozoic, Paleogene, Eocene), Baltic Journal of Coleopterology, 16, 27–35, 2016. 
Alekseev, V. I.: Coleoptera from the middle-upper Eocene European ambers: generic composition, zoogeography and climatic implications, Zootaxa, 4290, 401–443, https://doi.org/10.11646/zootaxa.4290.3.1, 2017a. 
Alekseev, V. I.: A new species of minute beetle (Coleoptera: Clambidae) from Baltic amber (Paleogene, Eocene), Zootaxa, 4337, 141–145, https://doi.org/10.11646/zootaxa.4337.1.8, 2017b. 
Alekseev, V. I.: First inclusion of a trichiine beetle (Coleoptera: Scarabaeidae) from Baltic amber, Palaeoentomology, 002, 425–429, https://doi.org/10.11646/palaeoentomology.2.5.4, 2019. 
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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.
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