Compare Aulacoseira pusilla

Compare

Aulacoseira pusilla differs from several Aulacoseira species with low-mantles by having curved pervalvar rows of areolae and a distinct, shelf-like ringleiste.

Aulacoseira alpigena has similar frustule proportions, size, mantle rows of areolae and ringleiste, but has thin spines at the end of each costa.

Aulacoseira subarctica has a higher mantle, a high ratio of mantle height to valve diameter, and longer spines.

Aulacoseira distans has a much lower density of mantle rows of areolae, the valve face is covered by areolae, thin spines are positioned at the end of each costa, a deep ringleiste is present, and numerous (4-12) prominent rimoportulae are visible in LM (in valve view). In the past, A. pusilla has been misidentified as A. distans, Note that A. distans is probably an extinct species.