Kobayasialla Parasubtilissima Guide
Credit: Loren Bahls
  1. Valves narrow
  2. Striae difficult to resolve
  3. Valve length-to-width ratio 6.0-9.3

Valves are narrow, 4.0-4.7 ┬Ám wide. The length to width ratio is 6.0-9.3. Striae are difficult to resolve, but appear to be radiate at the center.