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Information × Registration Number 0223U005219, 0123U102984 , R & D reports Title The role of particular fish groups in the functioning of late Mesozoic and Cenozoic ecosystems of Eastern Europe popup.stage_title Head Kovalchuk Oleksandr M., Доктор біологічних наук Registration Date 18-12-2023 Organization National Museum of Natural History National Academy of Sciences of Ukraine popup.description2 The object is late Cretaceous and Paleogene cartilaginous fish from the territory of Ukraine. The purpose of the work is to clarify the role of individual fish species and groups in the functioning of marine and freshwater ecosystems of the late Mesozoic and Cenozoic of Eastern Europe. Research methods — collection of paleontological material; morphometric, statistical, faunal and taphonomic analysis; paleoecological reconstruction. Isolated teeth of Ptychodus from the Upper Cretaceous deposits of Ukraine have a characteristic shape and are distinguished from other Mesozoic sharks by the specific structure of the occlusal surface. The potential prey of these durophagous sharks were cephalopods and bivalves, as well as decapod crustaceans. The study of a small series of teeth made it possible to establish the presence of a diverse group of sharks of the genus Ptychodus in the coastal areas of the Ukrainian Massif. Most of the identified species are the oldest known so far in the fossil record of the European Peri-Tethys. The presence of diverse and numerous prey in the epicontinental seas of the Late Cretaceous was obviously one of the factors that caused the appearance of a significant morphological diversity of teeth in ptychodus and possibly influenced the distribution of these sharks in different ecological niches or the separation of the latter. Marine basins that existed in the territory of Ukraine during Eocene were inhabited by representatives of various groups of cartilaginous and bony fishes. Fish remains from the Paleogene deposits of Kyiv are represented by teeth and vertebrae. The presence of one species of chimaera (Edaphodon bucklandi), as well as 12 taxa of sharks and 1 or 2 taxa of rays was established. Ten sharks have been identified to species level, while the rays have only been identified to higher taxonomic ranks. Most of these taxa are epi- and mesopelagic forms, while a small number of them wer benthopelagic, demersal and bathydemersal forms. Product Description popup.authors Kovalchuk Oleksandr popup.nrat_date 2023-12-18 Close