Discostella stelligera and D. pseudostelligera are much smaller in diameter, with distinct differences in stria density. While D. pseudostelligera also has external extensions of the marginal fultoportulae, the extensions are much longer on D. asterocostata.

LM scalebar = 10 µm
Discostella asterocostata LM5 Discostella asterocostata LM7 Discostella asterocostata LM3 Discostella asterocostata LM2 Discostella asterocostata LM4 Discostella asterocostata LM6 Discostella asterocostata LM1
13-31 µm
Striae in 10 µm

Discostella pseudostelligera

(Hust.) Houk and Klee 2004

Discostella pseudostelligera LM6 Discostella pseudostelligera LM7 Discostella pseudostelligera LM1 Discostella pseudostelligera LM4 Discostella pseudostelligera LM5 Discostella pseudostelligera LM3 Discostella pseudostelligera LM2
3.7-6.5 µm
Striae in 10 µm

Discostella stelligera

(Cleve and Grunow) Houk and Klee 2004

Discostella stelligera LM4 Discostella stelligera LM6 Discostella stelligera LM3 Discostella stelligera LM2 Discostella stelligera LM5 Discostella stelligera LM7 Discostella stelligera LM1
3.7-13.8 µm
Striae in 10 µm