Macrogastra ventricosa is a clausiliid living in forests. The photo was taken in small woody parts along Bystřice river between Olomouc and Bystrovany, the Czech Republic. It is Near Threatened species in the Czech Republic. The shell of this specimen is 17 mm long, but the animal is much smaller. The white base is a fungus growing on coarse woody debris. Dead wood helps to keep good humidity conditions for this and also for many other species.