Coeloptychium is an extinct genus of lychniscosidan hexasterophoran sea sponge which has often been used as an index fossil.R. M. Finks, R. E. H. Reid, and J. K. Rigby. 2004. Porifera (Demospongea, Hexactinellida, Heteractinida, Calcarea). Treatise on Invertebrate Paleontology Part E, Revised E(3):1-872 [W. Kiessling/W. Kiessling/W. Kiessling] Its remains have been found in Cretaceous sediments in Germany, Belgium, France and the UK.A. Schrammen. 1912. Die Kieselspongien der oberen Kreide von Nordwestdeutschland, Teil 2 Triaxonia (Hexactinellida) [Upper Cretaceous sponges from north-western Germany, part 2 Triaxonia (Hexactinellida)]. Palaeontographica, Supplement 5:176-385 [W. Kiessling/U. Merkel/U. Merkel] Coeloptyhcium is best preserved in Campanian sediments in Germany. The type species, C. agaricoides, was named in 1826.
Species Coeloptychium agaricoides Goldfuss, 1826 Coeloptychium bodei Schrammen 1912 Coeloptychium deciminum Roemer, 1841 Coeloptychium incisum Roemer, 1841 Coeloptychium lobatum Goldfuss, 1826 Coeloptychium princeps Roemer, 1861 Coeloptychium rude Zittel, 1876 Coeloptychium seebachi Zittel, 1876 Coeloptychium subagaricoides Sinov, 1871 Coeloptychium sulciferum Roemer, 1841
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