• Schizonema minusculum : (Grunow) Kuntze (1898)
• Navicula minuscula : Grunow A. (1880)
• Navicula importuna : Hustedt (1942)
• Craticula importuna : (Hustedt) K.Bruder e Hinz (2008)

The cells are solitary or joined in colonies. In valve view  the frustule has a lanceolate shape with rounded ends. The central raphe is straight and thin. Near the distal parts of the cell the ends of the raphe curve towards each other. There is a central nodule. The valve surface is covered in striae running from the raphe to the edges.

Freshwater environments.

Distribution: as Navicula minuscula (Grunow) in Europe: Great Britain (Ettl & Gärtner, 1995), Denmark (Ettl & Gärtner, 1995), Germany (Ettl & Gärtner, 1995), Romania (Caraus, 2002), Spain (Álvarez Cobelas and Estévez García, 1982), Sweden (Ettl & Gärtner, 1995); in Asia: China (Hu and Wei, 2006).

As Navicula importuna (Hustedt): in Europe: Romania (Caraus, 2002).

As Adlafia minuscula (Grunow) Lange-Bertalot; in Europe: Spain (Cantoral-Uriza & Aboal 2008).

The algae of Romania., Studii si Cercetari, Universitatea Bacau, Biologie 7, Caraus I., 2002, 1-694

Syllabus der Boden-, Luft- und Flechtenalgen., Stuttgart: Gustav Fischer, Ettl H., e Gärtner G., 1995, pp. i-vii,1-721

The freshwater algae of China. Systematics, taxonomy and ecology, China: www.sciencep.com., Hu H., Wei Y., 2006, 1-1023

Catálogo de las algas continentales españolas., I. Diatomophyceae Rabenhorst 1864. Lazaroa 4:, Álvarez Cobelas M., Estévez García A., 1982, 269-285

Diatomeas (Bacillariophyceae) del marjal Oliva-Pego, (Comunidad Valenciana, España)., Anales Jardín Botánico de Madrid 65(1), Cantoral-Uriza E.A., & Aboal M., 2008, 111-128