Cells have two chloroplasts and thin setae without chloroplasts. The setae cross slightly outside the chain edge forming wide windows. Chains are not curved and have resting spores with branching spines on one valve.
Apical axis measures 10-50 um.
Throndsen, J., Hasle, G.R. and Tangen, K., 2007. Phytoplankton of Norwegian coastal waters. Almater Forlag AS. 341 pp.