Guide to Aulacoseira pusilla
Credit: Marina Potapova
- Ratio of mantle height to valve diameter close to 1 or < 1
- Rows of areolae on mantle curve to the right
- Valve face flat or slightly convex
- Valve face with small scattered areolae
- Spines originate from two or three pervalvar costae
Valves are 4.5-7.5 µm in diameter, with a mantle height of 2.2-4.5 µm. The ratio of the mantle height to valve diameter is close to or slightly less than 1. Valve face is flat or very slightly convex with small scattered areolae. Rows of pervalvar areolae are curved to the right, 24-26 in 10 µm. Spines originate from two or three pervalvar costae. Ringleiste is solid, shelf-like.