Nannotax3 - ntax_cenozoic - Umbilicosphaera rotula Nannotax3 - ntax_cenozoic - Umbilicosphaera rotula

Umbilicosphaera rotula

Classification: ntax_cenozoic -> Coccolithales -> Calcidiscaceae -> Umbilicosphaera -> Umbilicosphaera rotula
Sister taxa: U. anulus, U. foliosa, U. hulburtiana, U. sibogae ⟩⟨ U. jafari, U. rotula ⟩⟨ U. bramlettei, U. jordanii, U. protoannulus ⟩⟨ U. detecta, U. edgariae, U. henrikseniae, U. sp.


Citation: Umbilicosphaera rotula (Kamptner, 1956) Varol, 1982
taxonomic rank: Species
Basionym: Tremalithus rotula Kamptner, 1956
Synonyms: NB Craspedolithus declivus is probably a synonym of Ceratolithus cristatus HET coccolithomorpha type, but the name has been applied to U. rotula specimens.
Taxonomic discussion: Was often placed in Geminilithella. The name Tremalithus rotula was invalidly described but the alternative combination Cycloplacolithus rotulus was validated by Kamptner 1956.

Distinguishing features:
Parent taxon (Umbilicosphaera): Central area open
This taxon: Coccoliths with wide central-area and narrow rim. Shields of similar size

Farinacci & Howe catalog pages: T. rotula * , C. aequiscutum * , C. cricotus * , U. lordi *


Umbilocosphaera coccoliths with wide central-area and narrow rim. Shields of similar size. The distal shield is slightly domed and is formed of shallowly imbricated elements, giving a complex suture pattern. The proximal shield consists of a single cycle of non-imbricated elements with nearly radial sutures, it is nearly flat except for a collar on its lower surface. A well developed tube separates the shields.

See also: Ceratolithus cristatus HET coccolithomorpha type - although unrelated this species can appear very similar;

Search data:
LITHS: placolith, circular, CA: vacant,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 3->6µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: The species is common or abundant through most of the Neoegene before becoming extinct in the Late Pliocene. Okada (2000) discussed the last occurrence (using the name Umbilicosphaera aequiscutum) and suggested it could be a useful marker within zone CN12d (NN18).
Last occurrence (top): within NN18 zone (1.93-2.39Ma, top in Gelasian stage). Data source: Okada 2000
First occurrence (base): within NN2 zone (19.00-22.82Ma, base in Aquitanian stage). Data source: Young 1998

Plot of occurrence data:


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Backman, J. (1980). Miocene-Pliocene nannofossils and sedimentation rates in the Hatton-Rockall Basin, NE Atlantic Ocean. Stockholm Contributions in Geology. 36: 1-91. gs O

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. gs O

Bown, P. R., Dunkley-Jones, T. & Young, J. R. (2007). Umbilicosphaera jordanii Bown 2005 from the Paleogene of Tanzania: confirmation of generic assignment and a Paleocene origination for the family Calcidiscaceae. Journal of Nannoplankton Research. 29(1): 25-30. gs

de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 79-145. gs O

Gartner, S. (1967a). Calcareous nannofossils from Neogene of Trinidad, Jamaica, and Gulf of Mexico. University of Kansas Paleontological Contributions, Papers. 29: 1-7. gs

Haq, B. U. & Berggren, W. A. (1978). Late Neogene calcareous plankton biochronology of the Rio Grande Rise (South Atlantic Ocean). Journal of Paleontology. 52: 1167-1194. gs

Jafar, S. A. (1975). Calcareous nannoplankton from the Miocene of Rotti, Indonesia. Verhandelingen der Koninklijke Nederlandse Akademie van Wetenschappen. 28: 1-99. gs O

Kamptner, E. (1948). Coccolithen aus dem Torton des Inneralpinen Wiener Beckens. Anzeiger der Österreichische Akademie der Wissenschaften, Wien. 157: 1-16. gs

Kamptner, E. (1956). Zur Systematik und Nomenklatur der Coccolithineen. Anzeiger der Österreichische Akademie der Wissenschaften, Wien. 93: 4-11. gs

Loeblich, A. R. & Tappan, H. (1978). The coccolithophorid genus Calcidiscus Kamptner and its synonyms. Journal of Paleontology. 52: 1390-1392. gs

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

Müller, C. (1974). Calcareous nannoplankton, Leg 25 (Western Indian Ocean). Initial Reports of the Deep Sea Drilling Project. 25: 579-633. gs

Okada, H. (2000). Neogene and Quaternary calcareous nannofossils from the Blake Ridge, Sites 994, 995, and 9971. Proceedings of the Ocean Drilling Program, Scientific Results. 164: 331-341. gs

Steinmetz, J. C. & Stradner, H. (1984). Cenozoic calcareous nannofossils from Deep Sea Drilling Project Leg 75, Southeast Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 75: 671-753. gs O

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

Varol, O. (1982). Calcareous nannofossils from the Antalya Basin, Turkey. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte. 4: 244-256. gs

Varol, O. (1989a). Calcareous nannofossil study of the central and western Solomon Islands. Circum-Pacific Council for Energy and Mineral Resources Earth Sciences. 239-268. gs

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 225-265. gs


Umbilicosphaera rotula compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-7-2024

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