Set number: 226

  • Helicosphaera granulatai 678 1
  • Helicosphaera granulatai 677 2
  • Helicosphaera granulatai 675 3
  • Helicosphaera granulatai 676 4
    10µm
Helicosphaera granulata, Middle Miocene, Gulf of Mexico

Set number: 223

  • Helicosphaera granulata 27087 1
  • Helicosphaera granulata 27084 2
  • Helicosphaera granulata 27090 3
  • Helicosphaera granulata 27092 4
  • Helicosphaera granulata 27088 5
  • Helicosphaera granulata 27085 6
  • Helicosphaera granulata 27089 7
  • Helicosphaera granulata 27091 8
    10µm
Helicosphaera granulata, Late Miocene, Gulf of Mexico

Set number: 222

  • Helicosphaera granulata 22763 1
  • Helicosphaera granulata 22762 2
  • Helicosphaera granulata 22759 3
  • Helicosphaera granulata 22766 4
  • Helicosphaera granulata 22764 5
  • Helicosphaera granulata 22761 6
  • Helicosphaera granulata 22760 7
  • Helicosphaera granulata 22765 8
    10µm
Helicosphaera granulata, Late Miocene, Gulf of Mexico

Set number: 224

  • Helicosphaera granulata 26968 1
  • Helicosphaera granulata 26970 2
  • Helicosphaera granulata 26973 3
  • Helicosphaera granulata 26974 4
  • Helicosphaera granulata 26969 5
  • Helicosphaera granulata 26971 6
  • Helicosphaera granulata 26972 7
  • Helicosphaera granulata 26975 8
    10µm
Helicosphaera granulata, Late Miocene, Gulf of Mexico
Final Epithet
Helicosphaera granulata (Bukry & Percival, 1971) Jafar & Martini, 1975
Basionym

Helicopontosphaera granulata Bukry & Percival 1971

Remarks

A helicolith characterised by a Type III (Helicosphaera carteri type) blanket, an expanded flange termination, and a central area adorned with permanent granulated structures. Helicosphaera granulata exhibits inclined extinction angles of about 50° on the blanket on the distal side and shows length-fast (−) elongation.

References

Black, M. 1971c. The systematics of coccoliths in relation to the paleontological record. In: Funnell, B. M. & Riedel, W. R. (eds), The Micropaleontology of the Oceans. Cambridge University Press, Cambridge pp. 611-624.

Bukry, D., Percival, S. F., 1971. New Tertiary calcareous nannofossils. Tulane Studies in Geology and Paleontology 8, 123-146.

Jafar, S. A., Martini, E., 1975, On the validity of the calcareous nannoplankton genus Helicosphaera. Senckenbergiana Lethaea 56, 381-397.

Kamptner, E., 1954. Untersuchungen über den Feinbau der Coccolithen. Archiv für Protistenkunde 100, 1-90.

Varol, O. 2025. A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication. 29: 1-222

Wallich, G. C., 1877. Observations on the coccosphere. Annals and Magazine of Natural History 19, 342-350.