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Vol 52, No 11 (2018)
- Year: 2018
- Articles: 2
- URL: https://journals.rcsi.science/0031-0301/issue/view/10251
Article
Upper Eocene Bivalves from Dnepr, Ukraine: Crassatellidae
Abstract
In the second part of the monograph, bivalves of the family Crassatellidae from the Upper Eocene Mandrikovka Beds of Dnepr (former city of Dnepropetrovsk, Ukraine) and its environs are described. The family Crassatellidae is represented by 25 species, 21 of which were established by the author. These species belong to the genera Crassatella (Crassatella) (seven species), Crassatella (Furvusa subgen. nov.) (one species), Crassatella (Bathytormus) (five species), Crassatina (Crassatina) (four species), Crassovella gen. nov. (four species), and Chattonia (three species). All of these taxa are described and provided with figures of type species. Species are figured in 15 plates. These taxa are mostly established on the shell material from the Upper Eocene beds exposed by the Rybalsky quarry in the city of Dnepr. Valves belonging to the new genus Crassovella and new subgenus Crassatella (Furvusa) come from the same beds. Three out of 25 species are described from a core of the same age, which was obtained during drilling in the vicinity of Dnepr (near the towns of Sinel’nikovo and Kamensky and the village of Vasil’kovka).
1225-1291
Taxonomic Composition of Gastropods from the Mandrikovka Beds of the Upper Eocene of Ukraine: Species List
Abstract
The results of long-term collecting and investigation by the author of the composition of Upper Eocene gastropods from the Mandrikovka Beds in the vicinity of Dnepr (former Dnepropetrovsk) are generalized in the form of table. The mollusk assemblage from these beds exceeds in richness and preservation all other Paleogene assemblages of the former USSR. Gastropod assemblages from two main localities of the Mandrikovka Beds, the village of Mandrikovka and Rybalsky granite quarry, are compared. The collection of the Rybalsky assemblage is divided by years to examine features of their distribution in enclosing deposits. The last assemblage is richer, with the considerable prevalence of small-sized species obtained by washing in sieves. This method of collecting is the main cause of a greater diversity of this assemblage. However, large species, which only occur in one locality, are also present. The extremely rich Paleogene fauna from these strata undoubtedly needs further revision. The table contains the data on the revision of particular groups, including that performed by the author; references to published figures; comparisons with the species names in the monograph of Klucznikov (1958). The text provides comparisons with the richest Eocene assemblages.
1292-1333