Halmphora Coffeaformis Guide
Credit: Josh Stepanek
  1. Valves strongly dorsi-ventral
  2. Dorsal striae continuous
  3. Striae 17-21 in center
  4. Valve ends protracted, narrowly rostrate to subcapitate

Valves are strongly dorsi-ventral. The raphe is positioned near the ventral margin. The proximal raphe ends are weakly inflated, with a slight dorsal deflection. A dorsal fascia is absent, and the dorsal striae are uninterrupted. Valve ends are protracted and narrowly rostrate to subcapitate.