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Oleksandr Kovalchuk            
National Museum of Natural History of the National Academy of Sciences of Ukraine
Kyiv, Ukraine
4 articles by this author
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An Early Miocene regurgitalite containing ...
Research Article
An Early Miocene regurgitalite containing basking shark remains from Slovenia: insight into cetorhinid paleoecology of the Central Paratethys
    Rok Gašparič,     Oleksandr Kovalchuk,     Martin Mazuch,     Martin Košťák,     Tomaž Hitij,     Martina Kočová Veselská,     Tomáš Kočí,     Zoltán Barkaszi
10.3897/sjp.145.203557
 20-07-2026
 Unique: 712 | Total: 826
 Reprint: € 6,00
 839-849
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Middle Miocene (Badenian) fishes from ...
Research Article
Middle Miocene (Badenian) fishes from the north-west of the Fore-Carpathian Basin
Anastasiia Dubikovska,     Marcin Górka,     Oleksandr Kovalchuk, Małgorzata Bieńkowska-Wasiluk, Ewa Świdnicka, Zoltán Barkaszi
10.1186/s13358-025-00408-y
 23-10-2025
 Unique: 160 | Total: 183
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A new seal from the Late Miocene of the ...
Research Article
A new seal from the Late Miocene of the Eastern Paratethys highlights the past regional diversity of true seals (Phocidae)
Pavlo Otriazhyi, Theodor Obadă,     Oleksandr Kovalchuk,     Davit Vasilyan,     Pavel Gol’Din
10.1186/s13358-025-00372-7
 12-06-2025
 Unique: 465 | Total: 650
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A rare window into a back-reef fish community ...
Research Article
A rare window into a back-reef fish community from the middle Miocene (late Badenian) Medobory Hills barrier reef in western Ukraine, reconstructed mostly by means of otoliths
Werner Schwarzhans, Oleksandr Klots,     Tamara Ryabokon,     Oleksandr Kovalchuk
10.1186/s13358-022-00261-3
 17-11-2022
 Unique: 421 | Total: 513
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