Thalassionema nitzschioides is a type of phytoplankton belonging to the pennate diatom group.

[1] Thalassionema nitzschioides are a yellow brown color.

[2] Their cells are straight and linear and they connect to form zigzagging chains.

[3] “Sometimes an apical spine is present and the marginal ornamentation is visible as ribs.”[4] Thalassionema nitzschioides can be found all over the world except in polar regions along shallow coastal ocean waters.

[5][6] Salinity and temperature conditions for optimal growth rate are 12-38 PPT and 15 °C respectively.