Calyptrosphaera pirus Kamptner; usually ascribed to Daktyletha (Norris, 1985)
After Young et al. 2003. BCs tube c. 10 crystallites high; wall fabric tiered; flange basal; distal cover recessed into a tube, domed with a ring of 8–10 pores around contact with tube; pores sometimes surrounded by internal ridges. CFCs more elevated and with a pyramidal central boss.
60º00'S 116º02'E Nishida (1986)