Cyclopyxis marinus Decloitre, 1977
Diagnosis: Compared to Cyclopyxis aplanata the pseudostome is very minimally invaginated. It is surrounded by a light area; but on the other hand, it is bordered by a strong dark, very regular thickening. The general color is darker than C. aplanata. Finally, the habitat totally different and so are the dimensions.
Dimensions: Diameter 150-160 μm; pseudostome 30-35 μm; height 30- 35 μm.
Ecology: Bonne Grâce beach on the waterfront, in the sand, hole 20 to 25 cm deep, France.