FISSURINA Reuss, 1850

 

 

Type species: Fissurina laevigata Reuss, 1850; OD(M).

Fissurina Reuss, I850 (*2573), p. 366.Hyaleina O. G. Costa, 1856 (*686), p. 366: type species: obj.; SD Loeblich and Tappan, I964 (*1910), p. C540.Ellipsolagena A. Silvestri. I923 (*2951), p. 265, 268: type species: Lagena acutissima Fornasini. I889 (*1150), p. 1; OD(M).Ellipsofissurina A. Silvestri. I923 (*2951), p. 265; type species: Fissurina laevigata Reuss, I850. obj.: SD Loeblich and Tappan, 1964 (*1910), p. C541.

Test rounded to ovate in outline, oval to lenticular in section, periphery may have one or more keels; wall calcareous, hyaline, finely perforate, surface smooth, with random or regularly aligned punctae; aperture terminal, ovate to slitlike, within a slightly depressed fissure at the test apex, provided internally with an entosolenian tube that may be cen­tral or may curve toward one side of the test and may be attached to the inner wall. Creta­ceous to Holocene; cosmopolitan.