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. 2011:(130):239-54.
doi: 10.3897/zookeys.130.1378. Epub 2011 Sep 24.

A long-living species of the hydrophiloid beetles: Helophorus sibiricus from the early Miocene deposits of Kartashevo (Siberia, Russia)

Martin Fikáček  1 , Alexander Prokin, Robert B Angus
Affiliations

A long-living species of the hydrophiloid beetles: Helophorus sibiricus from the early Miocene deposits of Kartashevo (Siberia, Russia)

Martin Fikáček et al. Zookeys. 2011.

Abstract

The recent hydrophiloid species Helophorus (Gephelophorus) sibiricus (Motschulsky, 1860) is recorded from the early Miocene deposits of Kartashevo assigned to the Ombinsk Formation. A detailed comparison with recent specimens allowed a confident identification of the fossil specimen, which is therefore the oldest record of a recent species for the Hydrophiloidea. The paleodistribution as well as recent distribution of the species is summarized, and the relevance of the fossil is discussed. In addition, the complex geological settings of the Kartashevo area are briefly summarized.

Keywords: Coleoptera; Helophorus; Hydrophiloidea; Kartashevo; Miocene; environmental stability; long-living species.

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Figures

Figures 1–2.
Figures 1–2.
Helophorus sibiricus (Motschulsky, 1860), photo of the early Miocene fossil No. PIN 3285/5 from Kartashevo 1 piece 2 counterpiece.
Figures 3–4.
Figures 3–4.
Helophorus sibiricus (Motschulsky, 1860), drawings of the early Miocene fossil No. PIN 3285/5 from Kartashevo 3 piece 4 counterpiece. Abbreviations: mp4 maxillary palpomere 4, clyp clypeus, fr frons, ics intercalary stria, mt mentum, scut mesoscutellum, aps anapleural sutures of mesothorax, mtv metaventrite, av1 abdominal ventrite 1.
Figures 5–9.
Figures 5–9.
Helophorus sibiricus (Motschulsky, 1860) 5 habitus of a recent specimen (Mongolia, Baga-Tenger, coll. National Museum, Prague) 6–7 detail of mentum, the arrow indicates a characteristic emargination on the anterior margin of mentum (6 fossil specimen, SEM micrograph 7 recent specimen, view from inside) 8–9 detailgranulation of head and pronotum, SEM micrographs (8 recent specimen 9 fossil specimen).
Figure 10.
Figure 10.
Fossil and recent distribution of Helophorus sibiricus (Motschulsky, 1860). Subfossil Holocene records omitted.
See this image and copyright information in PMC

References

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