Eupodiscus Radiatus
Credit: Emily Nodine, James Ehrman
  1. Valves circular with hexagonal areolae uniform across valve
  2. Prominent ocelli near valve margin, usually four
  3. Rimoportulae on valve margin
  4. Valve margin scalloped, forming circumferential ridge

Valves circular with hexagonal areolae uniformly distributed across valve; a distinct central area is absent. Prominent ocelli are present near the valve margin, usually 4, sometimes 3-6. Rimoportulae may be visible on interior valve interspersed with ocelli, 1-2 between each pair of consecutive ocelli. The valve margin is scalloped, forming a narrow circumferential ridge.