Helicosphaerella recta

(Haq, 1966) Aubry, Liu, de Vargas, & Probert in Aubry & Bord, 2009 Feb 23, 2021

Set number: 427

  • Helicosphaerella recta VR 028495 1
  • Helicosphaerella recta VR 028494 2
  • Helicosphaerella recta VR 028490 3
  • Helicosphaerella recta VR 028498 4
  • Helicosphaerella recta VR 028496 5
  • Helicosphaerella recta VR 028493 6
  • Helicosphaerella recta VR 028491 7
  • Helicosphaerella recta VR 028497 8
  • Helicosphaerella recta VR 028499 9
  • Helicosphaerella recta VR 028500 10
  • Helicosphaerella recta VR 028512 11
  • Helicosphaerella recta VR 028501 12
  • Helicosphaerella recta VR 028507 13
  • Helicosphaerella recta VR 028506 14
  • Helicosphaerella recta VR 028503 15
  • Helicosphaerella recta VR 028502 16
  • Helicosphaerella recta VR 028508 17
  • Helicosphaerella recta VR 028509 18
  • Helicosphaerella recta VR 028510 19
  • Helicosphaerella recta VR 028511 20
  • Helicosphaerella recta VR 028504 21
  • Helicosphaerella recta VR 028505 22
    10µm
Helicosphaerella recta, Middle Oligocene, DSDP Leg 25, Site 242, Mozambique Channel (Davie Ridge), Indian Ocean

Set number: 1651

  • Helicosphaerella recta VR 028700 1
  • Helicosphaerella recta VR 028697 2
  • Helicosphaerella recta VR 028695 3
  • Helicosphaerella recta VR 028701 4
  • Helicosphaerella recta VR 028699 5
  • Helicosphaerella recta VR 028698 6
  • Helicosphaerella recta VR 028694 7
  • Helicosphaerella recta VR 028702 8
  • Helicosphaerella recta VR 028704 9
  • Helicosphaerella recta VR 028703 10
  • Helicosphaerella recta VR 028717 11
  • Helicosphaerella recta VR 028705 12
  • Helicosphaerella recta VR 028710 13
  • Helicosphaerella recta VR 028709 14
  • Helicosphaerella recta VR 028708 15
  • Helicosphaerella recta VR 028706 16
  • Helicosphaerella recta VR 028711 17
  • Helicosphaerella recta VR 028712 18
  • Helicosphaerella recta VR 028715 19
  • Helicosphaerella recta VR 028716 20
  • Helicosphaerella recta VR 028707 21
    10µm
Helicosphaerella recta, Middle Oligocene, DSDP Leg 25, Site 242, Mozambique Channel (Davie Ridge), Indian Ocean

Set number: 426

  • Helicosphaerella bipuncta VR 028469 1
  • Helicosphaerella bipuncta VR 028467 2
  • Helicosphaerella bipuncta VR 028472 3
  • Helicosphaerella bipuncta VR 028473 4
  • Helicosphaerella bipuncta VR 028470 5
  • Helicosphaerella bipuncta VR 028468 6
  • Helicosphaerella bipuncta VR 028471 7
  • Helicosphaerella bipuncta VR 028474 8
  • Helicosphaerella bipuncta VR 028476 9
  • Helicosphaerella bipuncta VR 028475 10
  • Helicosphaerella bipuncta VR 028489 11
  • Helicosphaerella bipuncta VR 028477 12
  • Helicosphaerella bipuncta VR 028484 13
  • Helicosphaerella bipuncta VR 028483 14
  • Helicosphaerella bipuncta VR 028481 15
  • Helicosphaerella bipuncta VR 028479 16
  • Helicosphaerella bipuncta VR 028485 17
  • Helicosphaerella bipuncta VR 028486 18
  • Helicosphaerella bipuncta VR 028487 19
  • Helicosphaerella bipuncta VR 028488 20
  • Helicosphaerella bipuncta VR 028482 21
  • Helicosphaerella bipuncta VR 028480 22
  • Helicosphaerella bipuncta VR 028478 23
    10µm
Helicosphaerella recta, Late Oligocene, DSDP Leg 25, Site 242, Mozambique Channel (Davie Ridge), Indian Ocean

Set number: 1649

  • Helicosphaerella recta VR 024599 1
  • Helicosphaerella recta VR 024600 2
  • Helicosphaerella recta VR 024604 3
  • Helicosphaerella recta VR 024612 4
  • Helicosphaerella recta VR 024598 5
  • Helicosphaerella recta VR 024601 6
  • Helicosphaerella recta VR 024602 7
  • Helicosphaerella recta VR 024607 8
  • Helicosphaerella recta VR 024608 9
  • Helicosphaerella recta VR 024609 10
  • Helicosphaerella recta VR 024606 11
  • Helicosphaerella recta VR 024610 12
  • Helicosphaerella recta VR 024613 13
  • Helicosphaerella recta VR 024611 14
    10µm
Helicosphaerella recta, Middle Oligocene, DSDP Leg 25, Site 242, Mozambique Channel (Davie Ridge), Indian Ocean
Final Epithet
Helicosphaerella recta (Haq, 1966) Aubry, Liu, de Vargas, & Probert in Aubry & Bord, 2009
Basionym

Helicosphaera seminulum recta Haq, 1966

Synonyms

Helicosphaera recta (Haq, 1966) Jafar & Martini, 1975

Description

Sub-rectangular helicolith has an asymmetrical blanket (Type II, Helicosphaerella recta type), truncated flange termination and a central area with traverse conjunct bar with relatively small pores at both sides.

Remarks

Helicosphaerella recta is distinguished from Helicosphaerella truncata (Bramlette & Wilcoxon,1967) Aubry, Liu, de Vargas, & Probert in Aubry & Bord (2009) by having smaller central pores.

Helicosphaerella recta is distinguished from Helicosphaerella robinsoniae (Bown & Dunkley Jones, 2012) Varol, n. comb. by having a conjunct bar rather than a disjunct bar.

Helicosphaerella recta was described from Upper Eocene sediments but considered to be caved in here from Oligocene to Early Miocene sediments.

References

Bown, P. R. & Dunkley Jones T. 2012. Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research 32(2): 3-51.

Bramlette, M. N. & Wilcoxon, J. A. 1967. Middle Tertiary calcareous nannoplankton of the Cipero section, Trinidad, W.I. Tulane Studies in Geology and Paleontology 5: 93-131.

Haq, B. U., 1966. Electron microscope studies on some upper Eocene calcareous nannoplankton from Syria. Stockholm Contributions in Geology 15, 23-37.

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

Taxonomy
Helicosphaerella
Biostratigraphy
  • Phanerozoic
    • Cenozoic
      • Neogene
        • Miocene
          • Early Miocene
            • Burdigalian
      • Paleogene
        • Oligocene
          • Early Oligocene
            • Latdorfian
Stratigraphic Range
Latdorfian - Burdigalian
Age (Ma)
30.02 - 15.65
Holotype
Helicosphaerella recta VR 028494

Helicosphaera seminulum recta Haq, 1966

Late Eocene

Tabqua, Raqqa, NW Syria [borehole]