Chaetoceros diadema

Chaetoceros diadema is a diatom in the genus Chaetoceros. The easiest way to identify this species is by finding the very characteristic diadem-like resting spores.

Species description
Cells united into chains. Very characteristic, diadem - like spores (see species image). One chloroplast. The base of the setae is short.

Similar species
Chaetoceros constrictus is quite similar in the vegetative stage, but its resting spores are different from C. diadema resting spores.