An unusual echinoderm assemblage from the earliest Bajocian (middle Jurassic) of Luxembourg,with special emphasis on the ophiuroids (Echinodermata: Ophiuroidea)

An unusual echinoderm assemblage from the earliest Bajocian (middle Jurassic) of Luxembourg,with special emphasis on the ophiuroids (Echinodermata: Ophiuroidea)