AN ENDEMIC BALEEN WHALE FROM THE LATE MIDDLE MIOCENE OF ANCIENT EASTERN PARATETHYS SEA, KARAGIYE.

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dc.contributor.authorKadirbek, Dias
dc.date.accessioned2024-06-27T11:14:03Z
dc.date.available2024-06-27T11:14:03Z
dc.date.issued2024-04-26
dc.description.abstractThe easternmost part of the Cenozoic Eurasian megalake known as the Eastern Paratethys was in what is known today as Kazakhstan. It is one of the largest basins of the Parathetys and its sediments are well exposed in the Karagiye Depression south east of Aktau. In this depression, the late Middle Miocene to early Late Miocene (13.1-10.6 Ma) is very well represented, containing remnants of a unique and exceptionally rich endemic marine fauna. This fauna includes whales, dolphins, seals, sharks, and fishes from the Eastern Paratethys. Here, recently discovered new remains of whales from the Karagiye Depression have been studied. They have been identified as Otradnocetus virodovi. The remains include two cranial bones (tip of the mandible and posterior part of the rostrum), two vertebrae (thoracic and cervical vertebrae), four forelimb bones (two scapula parts, humerus and radius), two rib fragments and a hyoid bone. Stratigraphic ages of the studied bones (based on bio- and magnetostratigraphic studies) range from 13.1-13.0 Ma to 12.4-12.0 Ma. The bone measurement follows Mchedlidze (1984), Gol'din et al. (2014), Gol'din (2018), and references therein. Based on the anatomic and osteological peculiarities of the listed bones, it was possible to show that they belong to the species Otradnocetus virodovi, superfamily Cetotherioidea. The forelimb bones showed high diagnostic features of Otradnocetus virodovi, the vertebral bones showed high similarity with previously described specimens, the cranial and rib bones matched outlines of the Otradnocetus virodovi. Otradnocetus virodovi was originally described by Mchedlidze in 1984 from the Middle Miocene of North Caucasus. The vertebrate finds from the Karagiye Depression broadened the paleobiogeographic distribution of many Miocene Paratethyan marine species from Eastern and/or Central Paratethys. Otradnocetus is one of the earliest cetotheres findings. Its fossil record from Karagiye is the third find from Paratethys showing that this megalake was the region where this dwarf baleen whales evolved before their spreading to the global ocean.en_US
dc.identifier.citationKadirbek, D. (2024). An endemic baleen whale from the late Middle Miocene of Ancient Eastern Paratethys Sea, Karagiye. Nazarbayev University School of Mining and Geosciencesen_US
dc.identifier.urihttp://nur.nu.edu.kz/handle/123456789/8064
dc.language.isoenen_US
dc.publisherNazarbayev University School of Mining and Geosciencesen_US
dc.subjectBaleen whalesen_US
dc.subjectOtradnocetus virodovien_US
dc.subjectBone anatomyen_US
dc.subjectKaragiye depressionen_US
dc.subjectMiddle Mioceneen_US
dc.subjectEastern Paratethysen_US
dc.subjectType of access: Restricteden_US
dc.titleAN ENDEMIC BALEEN WHALE FROM THE LATE MIDDLE MIOCENE OF ANCIENT EASTERN PARATETHYS SEA, KARAGIYE.en_US
dc.typeBachelor's thesisen_US
workflow.import.sourcescience

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