Foraminifers of the genus Tournayellina Lipina, 1955

The genus Tournayellina (family Chernyshinellidae), important for stratigraphy of the Devonian-Carboniferous boundary interval, is revised. Species and generic morphological characters are considered and the species composition of the genus is revised. The evolution of the family is discussed and its geographical and stratigraphic distribution is examined. The species Tournayellina quadrilobata Postojalko, 1999 is redescribed in accordance with new data on its morphology. The new species T. intermedia Stepanova, sp. nov. is established.