• Synedra undulata: (J.W. Bailey) Gregory (1857)

Solitary. In valve view the frustule appears elongated with undulating margins, broadening slightly at the extremities and in the central area. The pseudoraphe cannot be distinguished. In the narrowest part of the valves a continuous hyaline line that becomes a dashed line at the extremities and in the central part of the valve is observed. There are areolae scattered over the valve surface.

A common species especially in tropical and subtropical waters but occasionally also found in temperate waters.

Distribution:  as Toxarium undulatum.Atlantic Ocean: Canary Islands (Gil-Rodríguez et al., 2003); North America: Nova Scotia (Kim, Garbary and McLachlan, 2004).

As Synedra undulata. Europe: Romania (Caraus, 2002), Spain (Varela, 1982).

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

Phytoplankton dynamics in Pomquet Harbour, Nova Scotia: a lagoon in the southern Gulf of St., Lawrence. Phycologia 43, Kim K.Y., Garbary D.J., McLachlan J.L., 2004, 311-328.

Notes on new species and localities of microscopical organisms., Smithsonian Contributions to Knowledge 7(3):, Bailey J.W., 1854, 1-15

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

Catálogo florístico de las diatomeas bentónicas de las costas de Galicia, Collectanea Botanica 13(2), Varela M., 1982, 987 - 996