Tetracyculus Hinziae Guide
Credit: Ian Bishop
  1. Valves lanceolate-elliptic with cuneate to rounded ends
  2. Rimoportula present
  3. Septa present

Valves are lanceolate-elliptic, with rounded to cuneate ends. A single rimoportula is located between the first and second costa, near the sternum. Septa are present and alternate between poles in adjacent copulae. Costae number 1-3 in 10 µm. Striae number 20-27 in 10 µm.