Guide to Rossithidium kriegeri
Credit: Marina Potapova
- Striae parallel throughout both valves
- Striae composed of two rows of areolae
- Striae interrupted in the central part of both valves, forming an asymmetric central area
The raphe valve is convex and the rapheless valve is concave. The valve margin is linear or linear-elliptic with rounded, slightly drawn-out, or slightly capitate ends. The striae are parallel throughout both valves. The striae consist of two rows of areolae (with exceptions). At the valve margin there may be one row of areolae. At the sternum and distal ends, there may be three rows of areolae. An asymmetric central area is present on both valves.