Pulleniatinidae

Globigerinid foraminifera, the initial and adult coils are streptospiral; the chambers increasingly embrace ventrally, so that the umbilicus becomes closed and aperture becomes wholly extraumbilical; in derived forms, the chambers begin to embrace dorsally, so that the last whorl covers much of the preceding whorls; the surface of the neanic chambers is punctate, perforation-pitted and spinose, but the surface of the adult chambers is encrusted and smooth, except for tubercles around the aperture; one extant genus, Pulleniatina, which occurs in the tropics.