Cymbaloporetta Cushman 1928

Schizont test benthic, early stage trochospiral, low to moderately high conical, later chambers low and crescentic and added in cycles, those of successive cycles alternating in position, final whorl with three to six subtriangular chambers separated by incised radial sutures or intercameral gaps, all chambers visible and sutures oblique and flush on the spiral side, only the final whorl visible on the flattened side where umbilical platelike chamber extensions may partially obscure the umbilicus, periphery subangular, peripheral margin weakly lobulate; wall calcareous, optically radial, coarsely perforate on the spiral side, umbilical side sparsely or not perforate, surface smooth; aperture in the early stage single, later with interiomarginal apertures at each side bordered with rimlike lips, a third aperture opening into the umbilicus may have the lip extended as a tube or funnel or produced as a flangelike plate around the umbilicus, with a single plate or a complex series of perforated plates over the center; gamont similar in the early stage but at gametogenesis temporarily becomes planktonic as it produces a large hemispherical lobulate float chamber over the umbilical side, lobes of the inflated and nonperforate float chamber corresponding in position to chambers of the final whorl, entire float chamber enclosed in a perforate walled balloon chamber, the float and balloon chambers separated by a space in which the gametes develop or less commonly the two chambers may adhere in places, balloon chamber also with many large rounded openings bordered by distinct lips in the central part of the terminal face. Pliocene to Holocene; cosmopolitan. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification)