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.