A late Maastrichtian "out-of-the-ordinary" ophiuroid from The Netherlands

A tetramerous specimen of a new late Maastrichtian ophiuroid species from the Meerssen Member (Maastricht Formation) as exposed at the ENCI NV quarry, south of Maastricht, is described and briefly discussed. Non-pentamerous specimens of this species which dominates ophiuroid assemblages known from this member at this locality, are extremely rare.