Set number: 995

  • Rhabdosphaera 1264 18 anba 1
    5µm
Rhabdosphaera poculii, Middle Miocene, Silifke, Turkey

Set number: 1000

  • Rhabdosphaera poculii 27601 1
  • Rhabdosphaera poculii 27600 2
  • Rhabdosphaera poculii 27597 3
  • Rhabdosphaera poculii 27606 4
  • Rhabdosphaera poculii 27602 5
  • Rhabdosphaera poculii 27599 6
  • Rhabdosphaera poculii 27598 7
  • Rhabdosphaera poculii 27604 8
    10µm
Rhabdosphaera poculii, Middle Miocene, Malta

Set number: 999

  • Rhabdosphaera poculii 22709 1
  • Rhabdosphaera poculii 22708 2
  • Rhabdosphaera poculii 22705 3
  • Rhabdosphaera poculii 22712 4
  • Rhabdosphaera poculii 22710 5
  • Rhabdosphaera poculii 22707 6
  • Rhabdosphaera poculii 22706 7
  • Rhabdosphaera poculii 22711 8
    10µm
Rhabdosphaera poculii, Middle Miocene, ODP Leg 154, Hole 925A, Ceará Rise, Equatorial Atlantic Ocean
Final Epithet
Rhabdosphaera poculii (Bona & Kernerne, 1966) Müller, 1974
Basionym

Rhabdolithus poculi Bona and Kernerne, 1966

Description

Rhabdolith has a circular base and a tall, hollow distal process with dome-like termination. The base of Rhabdosphaera poculii is usually detached; therefore, we often recover the distal process.

The holotypes of Rhabdosphaera poculii and Discosphaera jerkovicii Bona and Kernerne (1966) have a flaring distal process; therefore, they are believed to be a synonym of Discosphaera tubifera (Murray & Blackman 1898) Ostenfeld, 1900. The forms we identify as Rhabdosphaera poculii having dome shape distal process are compatible with the paratype of Rhabdosphaera poculii but not with the holotype of Rhabdosphaera poculii. A new species has to be established for these s forms with dome shape distal process.

Remarks

Rhabdosphaera poculii differs from Neogene Rhabdosphaera and Discosphaera tubifera by having a distal process with dome-like termination. Discosphaera tubifera has a distal process with distally flaring terminations, whereas Neogene Rhabdosphaera has a parallel-sided or club shape distal process.

References

Bona, J. & Kernerne, K., (1966): Mikropaleontologiae vizsgalotok a tekeres 1. sz. Foldtani alapfuras Miocen kepzodmenyein. Magyar Allami Foldtani Intezet. - Evi Jelentese. 1964: 113-137

Müller, C., (1974): Nannoplankton aus dem Mittel-Miozän von Walbersdorf (Burgenland). - Senckenbergiana Lethaea. 55: 389-405.

Murray, G. & Blackman, V. H., (1898): On the nature of the Coccospheres and Rhabdospheres. - Philosophical Transactions of the Royal Society of London B: Biological Sciences. 190(1): 427-441.

Ostenfeld, C. H., (1900): Über Coccosphaera. - Zoologischer Anzeiger. 23: 198-200.