Aktasia turonicus

(Varol & Girgis, 1994) Varol, in prep. Jan 17, 2026

Set number: 2795

  • Aktasia turonicus 12394 1
  • Aktasia turonicus 12397 2
  • Aktasia turonicus 12399 3
  • Aktasia turonicus 12402 4
  • Aktasia turonicus 12396 5
  • Aktasia turonicus 12398 6
  • Aktasia turonicus 12400 7
  • Aktasia turonicus 12401 8
    10µm
Aktasia turonicus, Late Cenomanian, The specific location cannot be disclosed.
Final Epithet
Aktasia turonicus (Varol & Girgis, 1994) Varol, in prep.
Basionym

Helicolithus turonicus Varol & Girgis, 1994

Description

Large species of Aktasia (> 6.0 µm) possess a zeugoid outer wall and a protolith inner wall composed of eight large sub-quadrilateral segments, with the central area spanned by an axial cross whose arms are composed of parallel longitudinal segments arranged in two halves and lacking a distal process.

References

Varol, O. & Girgis, M. 1994. New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 192: 221-253.

Taxonomy
Aktasia
Biostratigraphy
  • Phanerozoic
    • Mesozoic
      • Cretaceous
        • Late Cretaceous
          • Senonian
            • Coniacian
              • Late Coniacian
          • Middle Cretaceous
            • Cenomanian
              • Late Cenomanian
Stratigraphic Range
Late Cenomanian - Late Coniacian
Age (Ma)
95.47? - 85.70?
Holotype
Aktasia turonicus 12395 Aktasia turonicus 12395

Helicolithus turonicus

Turonian

Central North Sea area.