Plumatella repens (Linnaeus, 1758), floatoblast from La Niña Bonita Reservoir and the Ciénaga de Zapata Swamp (Cuba), SEM: A View of dorsal valve B View of ventral valve C Suture between valves is a single cord with a row of low tubercles on either side D Section of the annulus showing the connection between gas chambers, with circular pores with filiform extensions along the border. Scale bars: 50 µm (A, B); 10 µm (C); 5 µm (D).