Helicosphaera neogranulata
Set number: 417
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Set number: 419
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together with Helicosphaera princei
Set number: 418
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Set number: 461
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10µm
Helicopontosphaera neogranulata Gartner, 1977
A helicolith is characterised by a Type III (Helicosphaera carteri type) blanket, an expanded flange termination,and a central opening occupied by a delicate, non-permanentmesh often lost due to poor preservation. The elongated central opening is wider on the anterior side and features two indistinct short lateral projections. Helicosphaera neogranulata exhibits inclined extinction angles of about 63° on the blanket on the distal side and shows lengthfast (−) elongation.
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.
Holotype
Helicopontosphaera neogranulata
Gartner, 1977
Early Pleistocene
DSDP Leg 21, Site 206, New Caledonia Basin, Tasman Sea, Southwest Pacific