PLANOGLABRATELLA Seiglie and Bermudez, 1965

 

 

Type species: Discorbis nakamurai Asano.1951 (*881, p. 2: OD.Planoglabratella Seiglie and Bermudez. 196, 1*2853). p. 46.Truyolsia Gonzalez-Donoso. 1968(^*1263), p.76: type type Rosalina opercularis d'Orbigny- 1826(*2303). p. 271: OD.Test of medium size, up to 1.0 mm in diameter. planoconvex with subconical spiral side and flat umbilical side, trochospiral, about two rapidly enlarging whorls, chambers numerous. broad. and low, strongly' curved back ,it the periphery. about ten to eleven in the final whorl, sutures strongly curved on both sides. flush, umbilicus closed, periphery subangular: wall calcareous, optically radial, finely perforate, surface smooth on spiral side. umbilical side covered with numerous fine radial striae and centrally granulose or pustulose: aperture a low interiomarginal slit near the peripheral margin of the final chamber on the umbilical side. M. Miocene (Tortonian) to Holocene: Japan: Australia: Torres Strait: Cuba: USSR: Ukraine SSR.