Nove poznatky o hadicich ze svrchniho turonu ceske kridove panve

A new set of disarticulated skeletal elements of brittle stars from Upper Turonian hemipelagic sediments from the Úpohlavy Quarry was discovered recently. This new material helped to extend our knowledge of the systematics and to specify quantitative proportions of individual taxa. The first study of ophiuroids from this locality was already carried out by Štorc and Žítt (2008). Ten species are documented, pertaining to the orders of Ophiurida, Amphilepidida and Ophiacanthida. Another three species are probably present but their systematic position could not be determined due to the poor state of their preservation. The most frequent species are Ophiotitanos serrata, Ophiopeza? nekvasilovae, Ophiolepis cf. pulchra, Ophioderma substriatum and probably also Ophiojagtus cf. alternatus. Less common species are Amphilimna? plana and Manfredura sp. nov. On the other hand, Ophiodoris senonensis, Ophiotreta aff. striata and Ophiomusa sp. nov. are rare in the studied assemblage. Finally, the probable palaeoecology of ophiuroids is discussed.

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