The first fossil Coleoptera record from the Volyn Region, Ukraine, with description of a new Glesoconomorphus (Coleoptera, Mycteridae) in syninclusion with Winterschmidtiidae (Acari) and a key to species.

Dmitry Telnov,Dmitry V Vasilenko,Evgeny E Perkovsky,Shûhei Yamamoto

doi:10.3897/zookeys.1068.75391

Abstract

Glesoconomorphusekaterinaesp. nov. (Coleoptera, Mycteridae), representing the first ever fossil species of Coleoptera from the Volyn Region of Ukraine and the first mycterid from late Eocene Rovno amber, is described and illustrated. A key to species of the fossil mycterid genus Glesoconomorphus Alekseev, Pollock & Bukejs, 2019 is presented. The systematic position of Glesoconomorphus within Eurypinae J. Thomson, 1860 is briefly discussed. The oldest finding of phoretic Winterschmidtiidae Oudemans, 1923 mites, found on the type specimen of the new beetle species, is reported.

Highlights

Glesoconomorphus Alekseev, Pollock & Bukejs, 2019 was erected recently to hold the sole species G. nachzehrer Alekseev, Pollock & Bukejs, 2019 (Alekseev et al 2019) from Eocene Baltic amber (Aleksandrova and Zaporozhets 2008; Iakovleva 2017; Iakovleva et al 2021)
Eurypinae is a well-defined subfamily within Mycteridae, with the fol‐ lowing external features (Pollock 2010; Ivie and Pollock 2012): body slightly convex dorsally, head not produced to form a rostrum, compound eyes comparatively large, labrum exposed dorsally, insertions of antennae not concealed by lateral extension of frons, terminal maxillary palpomere subsecuriform, penultimate antennomere short, dorsal outline of pronotum subquadrate, pronotum laterally carinate, with paired postmedian impression, anterior margin of pronotum without transverse setal pad, scutellar shield flattened dorsally above level of elytra, elytra setose, irregularly punc‐ tate, procoxal cavities closed internally and open externally, procoxae contiguous, me‐ socoxal cavities closed internally and externally, penultimate tarsomere bilobate, tarsal claws swollen basally or with a distinct basal tooth (Alekseev et al 2019)
As discussed by Alekseev et al (2019), Glesoconomorphus differs from other ex‐ tant eurypine genera by the following combination of external features: ocular groove distinct, head without frontal furrows, compound eyes entire and strongly protruding from lateral outline of head, intrafacetal setae not present, prono‐ tum not laterally carinate, frontoclypeal suture not indicated, dorsum evenly punctate and setose

Summary

Introduction

Glesoconomorphus Alekseev, Pollock & Bukejs, 2019 was erected recently to hold the sole species G. nachzehrer Alekseev, Pollock & Bukejs, 2019 (Alekseev et al 2019) from Eocene Baltic amber (Aleksandrova and Zaporozhets 2008; Iakovleva 2017; Iakovleva et al 2021). Eurypinae is a well-defined subfamily within Mycteridae, with the fol‐ lowing external features (Pollock 2010; Ivie and Pollock 2012): body slightly convex dorsally, head not produced to form a rostrum, compound eyes comparatively large, labrum exposed dorsally, insertions of antennae not concealed by lateral extension of frons, terminal maxillary palpomere subsecuriform, penultimate antennomere short, dorsal outline of pronotum subquadrate, pronotum laterally carinate, with paired postmedian impression, anterior margin of pronotum without transverse setal pad, scutellar shield flattened dorsally above level of elytra, elytra setose, irregularly punc‐ tate, procoxal cavities closed internally and open externally, procoxae contiguous, me‐ socoxal cavities closed internally and externally, penultimate tarsomere bilobate, tarsal claws swollen basally or with a distinct basal tooth (Alekseev et al 2019). As discussed by Alekseev et al (2019), Glesoconomorphus differs from other ex‐ tant eurypine genera by the following combination of external features: ocular groove distinct, head without frontal furrows, compound eyes entire (non-emarginate) and strongly protruding from lateral outline of head, intrafacetal setae not present, prono‐ tum not laterally carinate (this feature differs in the second species discussed below), frontoclypeal suture not indicated, dorsum evenly punctate and setose

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