HALKYARDIA Heron-Allen and Earland. 1918
Type species: Cymbalopora radiata von Hagenow var. minima Liebus. 1911 (*1844), p.952: SD Cushman. 1928 (*747), p. 288.Halkyardia Heron-Allen and Earland. in Halkyard. 1999 (*1364). p. 107.
Test commonly small, up to about 1.3 mm in diameter, biconvex. spiral side more convex. megalospheric test with large hemispherical protoconch, large deuteroconch, and two primary auxiliary chambers, later chambers in numerous cycles. small as seen from the spiral side. arched toward the periphery and alternating in position with those of the pre-ceding cycle, only those of the final whorl visible on the opposite side. where the chambers appear elongate, inflated. and tubular. umbilical region beneath the embryonic chambers filled with a wide perforate plug formed by horizontal lamellae and connecting pillars, periphery subangular. peripheral outline lobulate: wall calcareous, optically radial. thickened by addition of lamellae on the distinctly perforate spiral side: no aperture other than the surface pores. M. Eocene (Lutetian) to M. Oligocene (Rupelian): Yugoslavia: France: Germans: USSR: Azerbavdzhan: India; Pacific: Bikini Atoll. Marshall Islands.