New data on Late Turonian crinoids from the Bohemian Cretaceous basin, Czech Republic

Abstract

Crinoid faunas from scour and burrow fills in the basal portions of the Upper Turonian Teplice Formation at the locality Úpohlavy, Bohemian Cretaceous Basin (BCB) comprise the bourgueticrinid Bourgueticrinus ex gr. fischeri (Geinitz, 1872) represented by cups, proximalia and columnals and, in contrast, the comatulid Placometra ex gr. laticirra (Carpenter, 1880), new to the BCB, preserved as complete cups. Analysis of articulated portions of arms and dissociated brachials in the assemblages allows specimens to be identified and assigned to Bourgueticrinus ex gr. fischeri?, Placometra ex gr. laticirra?, Placometra? sp. and "Isocrinus" sp. The original echinoderm community also included an indeterminate bourgueticrinid with "rhizocrinid" columnals. Life habits and taphonomy of these crinoids are discussed. The type specimen of Bourgueticrinus fischeri from similar crinoid associations in Saxony is in need of revision.