Open Conference Systems, Mathematical methods and terminology in geology 2018

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Biostatistic analyses of newly found pteropods (Mollusca, Gastropoda) in the Middle Miocene (Badenian) deposits from the southeastern Medvednica Mt. (Northern Croatia)
Ivana Derežić, Marija Bošnjak, Jasenka Sremac

Last modified: 2018-09-26

Abstract


Fossil Pteropoda (Gastropoda, Thecosomata) have been recorded in the Badenian marine deposits of the Medvednica Mt. in the area of Čučerje and Marija Bistrica. During the new research of the Middle Miocene deposits in the southeastern part of the Medvednica Mt., new pteropods were found at the Goranec locality. They are preserved as casts and molds, jug shaped and determined as genus Vaginella Daudin, 1800. Biostatistics is a crucial tool in vaginellid species-level determination, which is often problematic due to their similar shell morphology and poor preservation. Based on the height, width and apical angle measurements of the collected casts and molds, biostatistical analysis were made and compared with the previous analysis of vaginellids from the Čučerje area. Majority of the specimens belong to Vaginella austriaca Kittl, 1886, which is the most abundant pteropod species in the Miocene deposits of the Paratethys. Here presented pteropod records point to the maximum of the Badenian marine transgressions, and contribute to the further palaeoecological and palaeogeographical research in the southwestern part of the Central Paratethys, Pannonian Basin System.

Keywords


Biometry; Pteropoda; Vaginella austriaca; Badenian; Medvednica Mt.

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