Helenea dikrorhethe

(Hill, 1976) Varol, n. comb. Feb 10, 2026
H dikrorhethe 3 Hill SEM a

SEM photo of Helenea dikrorhethe from Hill, 1976 (Pl. 15, Fig. 30)

Set number: 3102

  • Helenea dikrorhethe 2903 1
  • Helenea dikrorhethe 2902 2
  • Helenea dikrorhethe 2900 3
  • Helenea dikrorhethe 2901 4
    10µm
Helenea dikrorhethe, Late Aptian, Gargas, SE France

Set number: 3103

  • Helenea dikrorhethe 13328 1
  • Helenea dikrorhethe 13330 2
  • Helenea dikrorhethe 13332 3
  • Helenea dikrorhethe 13336 4
  • Helenea dikrorhethe 13329 5
  • Helenea dikrorhethe 13331 6
  • Helenea dikrorhethe 13333 7
  • Helenea dikrorhethe 13334 8
  • Helenea dikrorhethe 13335 9
    10µm
Helenea dikrorhethe, Late Aptian, Arabian Peninsula (The specific location cannot be disclosed)
Final Epithet
Helenea dikrorhethe (Hill, 1976) Varol, n. comb.
Basionym

Cretarhabdus dikrorhethe Hill, 1976

Dimensions Of Holotype

Holotype length: 8.0 µm

Description

Large (>6.0 µm), subcircular to elliptical species of Helenea are characterised by a large central area spanned by an axial cross with bifurcated arm terminations, supporting a short distal process with a distinct square-shaped termination. The bifurcations create small openings between the terminal ends of the longitudinal arms of the cross and the pelaga.

References

Hill, M. E. 1976. Lower Cretaceous calcareous nannofossils from Texas and Oklahoma. Palaeontographica Abteilung B Palaeophytologie. 156: 103-179.

Taxonomy
Helenea
Biostratigraphy
  • Phanerozoic
    • Mesozoic
      • Cretaceous
        • Early Cretaceous
          • Middle Cretaceous
            • Albian
              • Late Albian
            • Aptian
              • Late Aptian
Stratigraphic Range
Late Aptian - Late Albian
Age (Ma)
118.76? - 100.50?
Holotype
Helenea dikrorhethe 2900 Helenea dikrorhethe 2900

Helenea dikrorhethe Hill, 1976

Late Albian

Duck Creek Formation, Texas, USA