Helicopontosphaera neogranulata Gartner, 1977
Helicolith has a Type III (Helicosphaera carteri type) blanket, an expanded flange termination and a wide elongated central opening which is wider at one end.
Helicosphaera neogranulata differs from any other species of Helicosphaera by having a large slit-like opening that widens at one end.
Gartner, S., 1977. Calcareous nannofossil biostratigraphy and revised zonation of the Pleistocene. Marine Micropaleontology 2, 1-25.
Haq, B. U., Berggren, W. A., 1978. Late Neogene calcareous plankton biochronology of the Rio Grande Rise (South Atlantic Ocean). Journal of Paleontology 52, 1167-1194.
Sato, T., Kameo, K., Takayama, T., 1991. Coccolith biostratigraphy of the Arabian Sea. Proceedings of the Ocean Drilling Program, Scientific Results 117, 37-54.
DSDP Leg 21, Site 206, New Caledonia Basin, Tasman Sea, Southwest Pacific