Circolites kotoucensis Mikulaš, 1992

Diagnosis: Shallow, roughly circular pits in carbonate substrates. The peripheral edge of the pit is sharp, the walls of the pit are perpenticular to or overhanging the substrate surface. The edges of some pits are undulated, the pit bottom is moderately concave. The diameter of pits is usually 10 to 4mm, their depth 3 to 10 mm. They were formed by boring echinoids. The pits often occur in major groups, in some cases touching one another.