Guide to Cocconeis coreana
- Raphe valve with striae interrupted by submarginal, hyaline ring
- Raphe valve with 15-24 areolae in 10 µm
- Valvocopula with clamp-like fimbriae
- Rapheless valve with striae parallel at the center
- Rapheless valve with 11-14 areolae in 10 µm
The raphe valve has a narrow axial area, pronounced central area, and straight filiform raphe. Striae are parallel at the center and radiate and slightly curved near the apices. Areolae are 15-24 in 10 µm, within a stria. Striae are interrupted by a hyaline, submarginal ring. Valvocopula with clamp-like fimbriae.
The rapheless valve has striae that are parallel at the center; radiate and slightly curved near the apices. Areolae number 11-14 in 10 µm, within a stria.