Palaeobiography of selected taxa of Miocene Bryozoa

Zágorsek, Kamil (2015) Palaeobiography of selected taxa of Miocene Bryozoa. Hantkeniana, 10. pp. 125-134. ISSN 1219-3933

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Abstract

Evidences for a bryozoan event during Badenian (Middle Miocene) time were recognized in several sections in northsouth transect through the Paratethys. In each section the species composition was studied in detail. The majority of species involved in the bryozoan event are same in all studied sections. Nevertheless, a slight trend can be recognized. In the north sections bryozoans with erect growth forms are dominant, while in south sections prevail the species with encrusting and free living growth forms. Easily recognizable bryozoan species Pirabasporella, Skylonia, Costatimorpha and representatives of family Chlidoniopsidae were selected for palaeobiogeographic study. The distribution of these species from Eocene to Miocene (up to Recent respectively) show, that the Atlantic was not an obstacle for dispersal of bryozoans and the connection between the Paratethys and the Indian Ocean up to Australian waters can be explained through the shallow basins in Middle East. Moreover, the study suggests that the Paratethys was probably the biodiversity hot-spot during Eocene and Miocene; many genera later spread over the world originated here.

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