Guide to Gomphoneis herculeana
Credit: Pat Kociolek
- Valves lanceolate-clavate
- Longitudinal lines present
Valves are large and robust and strongly lanceolate-clavate. The axial area is narrow and straight. The central area is relatively small, irregularly rounded and bears a single stigma. The longitudinal lines are positioned approximately one-half the way between the axial area and margin.