Nannotax3 - ntax_cenozoic - Umbilicosphaera rotula

Citation: Umbilicosphaera rotula (Kamptner, 1956) Varol, 1982

Basionym: Tremalithus rotula Kamptner, 1956

Synonyms:

Cyclococcolithus rotula Kamptner 1956 p.10, ex Kamptner 1948 p.8, pl.2/15; Muller 1974a p.591, pl.3/6-8; Muller 1974b p.391, pl.1/7-8; Jafar 1975a p.72 pl.8/2,18-19 (?pl.2/20-23).
Cyclococcolithus aequiscutum Gartner 1967b p.4, pl.7/1-4.
Cyclococcolithus cricotus Gartner 1967b partim pl.7/7, non pl.7/5-6. (=Pseudoemiliania lacunosa).
Calcidiscus aequiscutum (Gartner) Loeblich & Tappan 1978 p.1391; Steinmetz & Stradner 1984 partim, pl.24/3-6 non pl.24/1-2 (=Coronocyclus nitescens).
Cyclolithella rotula (Kamptner) Haq & Berggren 1978 p.1192, pl.1/15-16.
Geminilithella rotula (Kamptner) Backman 1980 p.52, pl.1/14-15, 8/3; Theodoridis pl.3/1-2.
Umbilicosphaera lordii Varol 1982 p.248, pl.4/5
Geminilithella lordii (Varol 1982) Varol 1989
Umbilicosphaera cricota (Gartner, 1967) Aubry, 1993
Umbilicosphaera aequiscutum (Gartner, 1967) Aubry, 1993

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

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.

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

References:

Aubry, M-P. (1993a). Calcareous nannofossil stratigraphy of the Neogene formations of eastern Jamaica. Geological Society of America. -. gs

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

References:

Add Comment

Comments