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Guide to Platessa stewartii

(R.M.Patrick) Potapova 2012

Platessa Stewarti Guide
Credit: Marina Potapova
  1. Valves elliptic
  2. Axial area narrow
  3. Central area on raphe valve transversely rectangular
  4. Central area on rapheless valve small, often asymmetric
  5. Stria density 14-18 in 10 µm

Valves are elliptic. Both valves have a linear axial area. The central area on the raphe valve is transapically rectangular, often reaching valve margins. The central area on the rapheless valve is small and often asymmetric. Striae are radiate and biseriate. The stria density on both valves is 14-18 in 10 µm.