Helicosphaera acuta

Theodoridis, 1984 Sep 11, 2020

Set number: 346

  • Helicosphaera acuta 2973 1
  • Helicosphaera acuta 2974 2
  • Helicosphaera acuta 2967 3
  • Helicosphaera acuta 2971 4
  • Helicosphaera acuta 2970 5
    10µm
Helicosphaera acuta, Early Pleistocene, Gulf of Mexico
Final Epithet
Helicosphaera acuta Theodoridis, 1984
Basionym

Helicosphaera acuta Theodoridis 1984

Description

Elongated helicolith having a Type III (Helicosphaera carteri type) blanket, truncated flange termination and a central area with two inversely aligned pores.

Remarks

Helicosphaera acuta differs from Helicosphaera burkei, Helicosphaera wallichii, Helicosphaera sellii and Helicosphaera inversa by having truncated flange termination and elongated shape.

References

Theodoridis, S., (1984): Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. - Utrecht Micropaleontological Bulletin. 32: 1-271.

Taxonomy
Helicosphaera
Biostratigraphy
  • Phanerozoic
    • Cenozoic
      • Quaternary
        • Pleistocene
          • Early Pleistocene
            • Calabrian
            • Gelasian
Stratigraphic Range
Gelasian - Calabrian
Age (Ma)
2.58? - 1.92
Holotype
Helicosphaera acuta 2974

Helicosphaera acuta

Pleistocene

DSDP Leg 47, Site 397, Contitental Slope off Cape Bojador, Spanish Sahara