Guide to Caloneis amphisbaena
Credit: Sarah Spaulding
- Apices capitate
- Expanded central area
- Longitudinal lines present
Valves are large with capitate apices. The central area is greatly expanded and lanceolate rhombic in shape. The raphe is straight with expanded proximal ends. Striae are radiate throughout most of valve, becoming parallel to convergent at the apices. Two distinct longitudinal lines are present.