Helicosphaera neogranulata

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.