The cells may be solitary or joined in straight colonies of varying length. In girdle view the valves have slightly rounded margins due to the presence of small protuberances from which thin, spine-like structures emanate, enabling two adjacent cells to bind to each other. At the base of each protuberance the valve is perforated by small slits, rarely visible by optical microscope. The space between two cells is narrow. There is a central labiate process. The cylindrical cells have a thin, slightly silicified wall. There are numerous small chloroplasts distributed throughout the cytoplasm.

Marine, cosmopolitan.

Distribution: as Cerataulina bergonii. Europe: Romania (Caraus, 2002).

As Cerataulina pelagica. Europe: Croatia (Vilicic et al., 2009), Romania (Caraus, 2002); Atlantic Ocean: Canary Islands (Gil-Rodríguez et al., 2003).

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

The plankton diatoms of the Southern Seas., Discovery Reports 16:, Hendey N.I., 1937, 151-364

Composition and annual cycle of phytoplankton assemblages in the northeastern Adriatic Sea., Botanica Marina 52(4), Vilicic, Djakovac, Buric, Z. & Bosak, 2009, 291-305.

Proctoctista. In: Lista de especies marinas de Canarias (algas, hongos, plantas y animales). (Moro, L., Martín, J.L., Garrido, M.J. & Izquierdo, I. Eds), Las Palmas: Consejería de Política Territorial y Medio Ambiente del Gobierno de Canarias., Gil-Rodríguez M.C., Haroun R., Ojeda Rodríguez A., Berecibar Zugasti E., Domínguez Santana P., Herrera Morán B., 2003, 5 - 30