Karayevia Nitidiformis Guide
Credit: Megan Otu
  1. Valve ends capitate
  2. Axial area on rapheless valve narrowly lanceolate
  3. Striae on raphe valve not interrupted
  4. Striae on rapheless valve interrupted

Valves are linear-elliptical with capitate apices and are less than 5 ┬Ám wide. Both raphe and rapheless valves lack a distinct central area. Striae are slightly radiate to parallel. The striae on raphe valve are NOT interrupted by a longitudinal line in the central valve. The striae on the rapheless valve are interrupted by a narrow longitudinal hyaline area on each side of the valve.