Nannotax3 - ntax_cenozoic - Pseudoemiliania ovata

Citation: Pseudoemiliania ovata (Bukry, 1973) Young 1998

Basionym: Emiliania ovata Bukry, 1973

Synonyms:

Reticulofenestra pacifica Nishida (1979) [cf Young 1990]
Pseudoemiliania lacunosa varieties A & B of Matsuoka & Okada (1989)
Reticulofenestra lacunosa var. ovata (Bukry 1973) Young 1990
Salisia gartneri Varol (2004) - almost circular
Discoaster ovata - Lourens et al. 2004 accidentally used this name when recording the FO of P. ovata and it has subsequently been copied into TimeScaleCreator and other compilations of biostratigraphic data.

Taxonomic discussion: P. ovata and P. lacunosa intergrade and many workers do not distinguish them. See Young (1990) for extended discussion of the relationship between lacunosa and ovata. There is continuous variation within the group and if it is thought useful to subdivide them further then it would probably be most practical to simply do this by using size /shape classes without assigning names - as has been done by for instance Matsuoka & Okada (1989).

Morphology: Coccoliths similar to P. lacunosa but elliptical and with <12 slits in the distal shield.

Geological Range:
Notes: Very abundant in Late Pliocene
Last occurrence (top): within NN19 zone (0.44-1.93Ma, top in Ionian stage). Data source: Young 1998
First occurrence (base): within NN14 zone (3.92-4.13Ma, base in Zanclean stage). Data source: Young 1998

References:

Bukry, D. (1973c). Coccolith stratigraphy, eastern equatorial Pacific, Leg 16, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 16: 653-711. gs V O

Lourens, L. J., Hilgen, F. J., Shackleton, N. J., Laskar, J. & Wilson, D. (2004). The Neogene Perion. In, Gradstein, F. M., Ogg, J. G. & Smith, A. (eds) A Geologic Time Scale. Cambridge University Press, Cambridge 409-440. gs

Matsuoka, H. & Okada, H. (1989). Quantitative analysis of Quaternary nannoplankton in the subtropical Northwestern Pacific Ocean. Marine Micropaleontology. 14: 97-118. gs

Nishida, S. (1979). Atlas of Pacific Nannoplanktons. News of Osaka Micropaleontologists, Special Paper. 3: 1-31. gs

Varol, O. (2004). Salisia n.g. – a new Pliocene-Pleistocene coccolith genus. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte. 2004(2): 119-128. gs

Young, J. R. (1990). Size variation of Neogene Reticulofenestra coccoliths from Indian Ocean DSDP cores. Journal of Micropalaeontology. 9: 71-86. gs V O

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

Tags	LITHS: placolith, elliptical, CA: ca_conjunct, grill, vacant, CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent,
Metrics	Lith size: 3->6µm;

Pseudoemiliania ovata

References:

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