Engel, H. 1964b. On Winkleria maastrichtensis nov. gen. et nov. spec. (Echinoidea, Regularia, Stirodonta, Phymosomina ?Phymosomatidae) from the Upper-Cretaceous (Md) of Maastricht (Limburgs). Beaufortia, 10, 207-211.
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Engel H nov gen et nov spec
1964
On Winkleria maastrichtensis Phymosomina ?Phymosomatidae) from the Upper-Cretaceous (Md