Diagnosis
provided by World Register of Marine Species
Test ovate in outline, slightly compressed in section, two chambers per whorl, added in continually changing planes to result in a sigmoid chamber arrangement of two tightly spiralling series, up to seven chambers visible from the exterior, chambers lack wall extensions over the earlier part of the test like those of Sigmoilina or Nummuloculina; wall calcareous, porcelaneous, polished; aperture an arched opening at the end of the final chamber, with a simple to bifid tooth. Holocene; Greece. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification)
Loeblich, A. R.; Tappan, H. (1987). Foraminiferal Genera and their Classification. Van Nostrand Reinhold Company, New York. 970pp.
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