Helenea conus

(Worsley, 1971) Rutledge & Bown in Bown et al., 1998 Feb 09, 2026

Set number: 3098

  • Helenea conus 3569 1
  • Helenea conus 3570 2
  • Helenea conus 3571 3
  • Helenea conus 3572 4
    10µm
Helenea conus, Early Valanginian, DSDP Leg 76, Site 534, Blake-Bahama Basin, Atlantic Ocean
Final Epithet
Helenea conus (Worsley, 1971) Rutledge & Bown in Bown et al., 1998
Basionym

Staurolithites? conus Worsley, 1971

Description

Large (>8.0 µm), circular to subcircular (ellipticity <1.5) species of Helenea are characterised by a large central area spanned by a cross with bifurcated arm terminations, supporting a short distal process with a distinct square-shaped termination.

Helenea conus was originally defined as a circular species, but is emended here to include subcircular specimens.

References

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In: Bown, P. R. (Ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131

Worsley, T. R., 1971. Calcareous nannofossil zonation of Upper Jurassic and Lower Cretaceous sediments from the Western Atlantic. In: Farinacci, A. (ed.), Proceedings of the Second Planktonic Conference Roma 1970. Edizioni Tecnoscienza, Rome vol. 2, pp. 1301-1321.

Taxonomy
Helenea
Biostratigraphy
  • Phanerozoic
    • Mesozoic
      • Cretaceous
        • Early Cretaceous
          • Middle Cretaceous
            • Barremian
              • Early Barremian
          • Neocomian
            • Berriasian
              • Early Berriasian
Stratigraphic Range
Early Berriasian - Early Barremian
Age (Ma)
143.10? - 125.08?
Holotype
Helenea conus 3569 Helenea conus 3569 Helenea conus 3569

Helenea conus Worsley, 1971

Berriasian - Valanginian

JOIDES, DSDP Leg 1, Site 5A, Caribbean Sea.