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
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
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
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]