Halamphora veneta

Valves are semi-lanceolate and strongly dorsiventral, with a smoothly arched dorsal margin and a straight to slightly concave ventral margin. Valve ends are rostrate and ventrally curved. The raphe is positioned near the ventral margin, and is straight or with a slight curve dorsally moving from the poles to the central area. Proximal raphe endings are straight or with a slight dorsal deflection. The axial area is narrow, and more prominent on the ventral side. Dorsal and ventral fascia are absent. Dorsal striae are distinctly punctate, more so in the central area, and radiate throughout. Ventral striae are composed of a continuous row of short striae near the valve margin. The ventral striae are often difficult to resolve in the LM depending on the valve angle.