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Guide to Tetracyclus emarginatus

(Ehrenb.) W.Smith 1856

Tetracyclus emarginatus guide
  1. Valves cruciform
  2. Central inflation notched
  3. Apices rounded to subcapitate
  4. Septa present

Valves are cruciform, with a large central inflation that is notched on each side. The apices are rounded to subcapitate. Costae are thick and semi-regularly spaced at 2-3 in 10 µm. The axial area is linear, with a narrow sternum that terminates before the apices. Septa are present on the girdle bands.