Odontella sinensis (Bacillariophyceae, Mediophyceae, Eupodiscales, Odontellaceae), after cell division, width 45 µm, Helgoland 04.2015. 0:13 min. The cushion-like cells, up to 400 µm in length, form chains. At each corner of these cells a blunt process and a long spine is situated. The blunt processes of two cells touch each other, and the spines cross each other, stabilizing the chain. The species may occur in dense blooms. Video can be used for teaching.