A sediment-compacted and decorticated carapace, preserving the left cheliped and a portion of the left eye stalk, from the socalled 'Nucula Klei’ of previous authors (= Kleine Spouwen Member, Bilzen Formation, Rupel Group), of Early Oligocene age, constitutes the first record of Coeloma rupeliense STAINIER, 1887 from temporary sections along the Albertkanaal between Kesselt and Veldwezelt (Limburg, northeast Belgium). Coeloma rupeliense is commonly preserved in concretions from the correlative Boom Formation in the provinces of Oost-Vlaanderen and Antwerpen, north of the rivers Rupel and Nete (northwest Belgium), and has also been recorded from the Lower Oligocene of northern Germany, both in situ and from erratic boulders. Some notes on the genus Coeloma A. MILNE-EDWARDS, 1865, and on species assigned to it, are added.