Metacystis (met-ah-sis-tiss) lagenula has a transparent lorica which is formed like an Erlenmeyer flask. The oral aperture is equiped with long pectinelles. There is a conspicuous caudal cilium and the contractile vacuole can be seen in the posterior third of the cell. This specimen was collected in freshwater ponds near Konstanz, Germany. Differencial interference contrast.
