Comparatively common lateral arm plates from Turonian strata in the Czech Republic are assigned to the amphiurid brittlestar species Amphiura? plana Kutscher et Jagt in Jagt, 2000, which is also known from the Campanian and Maastrichtian of northern Germany, southern Sweden, Denmark, the Netherlands and Belgium. This species appears to represent an evolutionarily conservative lineage with extensive paleogeographical and stratigraphic ranges, in excess of 20 or 25 million years. The abundance of Amphiura? plana, based on lateral arm plates, amounts to about 5 % at Velim, where three other species are commoner still.