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New data on Arthropterygius Maxwell, 2010 shows that it is not rare, but a most abundant ichthyosaur genus of the Late Jurassic and earliest Cretaceousтезисы доклада Тезисы
- Автор: Nikolay Zverkov
- Сборник: The Palaeontological Association 62nd Annual Meeting, PROGRAMME, ABSTRACTS and AGM papers
- Тезисы
- Год издания: 2018
- Место издания: University of Bristol, England
- Первая страница: 116
- Последняя страница: 116
- Аннотация: The ichthyosaur genus Arthropterygius has heretofore been considered as rare and poorly known. Recently excavated unique material from the Berriasian of the Russian Extreme North and examination of historical collections in Russian museums provided numerous specimens referable to Arthropterygius. The new data, combined with examination of ichthyosaurs from Svalbard, give us reason to refer most of the Svalbard ichthyosaur genera to Arthropterygius. Therefore, we recognize four species within the genus: Arthropterigius chrisorum (Russell, 1993), A. volgensis (Kasansky, 1903) comb. nov., A. hoybergeti (Druckenmiller, Hurum, Knutsen, Narkem, 2012) comb. nov. and A. lundi (Roberts, Druckenmiller, Sætre and Hurum, 2014) comb. nov. Three of the species are found in both European Russia and the Arctic. This, together with the evidence of the presence of Arthropterygius in the Southern Hemisphere, allows the suggestion that Arthropterygius was probably the most common and widespread ichthyosaur genus in the Late Jurassic and earliest Cretaceous. Our phylogenetic analysis places the clade of Arthropterygius species close to the base of Ophthalmosauridae as a sister group either to ophthalmosaurines or to platypterygiines. Although its position is still uncertain, this is the most well-supported clade among ophthalmosaurids (Bremer support value of 5, Bootstrap exceeding 80) that further augments our taxonomic decision.
- Добавил в систему: Зверьков Николай Геннадьевич