Pseudoemiliania


Classification: Coccolithophores -> Isochrysidales -> Noelaerhabdaceae -> Pseudoemiliania
Sister taxa: Emiliania, Gephyrocapsa, Pseudoemiliania, Reticulofenestra, Noelaerhabdus, Bekelithella, Pyrocyclus,

Daughter taxa: (blue => in age window 0-800Ma)
Circular to sub-circular with >12 slits, length >4µm
Elliptical and with <12 slits in the distal shield
Specimens which cannot be assigned to established species

Taxonomy:

Citation: Pseudoemiliania Gartner, 1969
Rank: Genus
Type species: Pseudoemilinia lacunosa Kamptner 1963 ex Gartner 1969
Synonyms:
Notes & discussion: Intergrades with Reticulofenestra minutula in the Late Pliocene and with R. asanoi in the Pleistocene, see Young (1990) for further discussion. If it is thought useful to subdivide the genus 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).
The validity of Pseudoemiliania has been disputed but van Heck (1990) showed that the name was validly proposed by Gartner.

Distinguishing features: With slits between some of the distal shield elements

Farinacci & Howe catalog pages: Pseudoemiliania * , Ellipsoplacolithus * , Salisia *


Morphology remarks: Coccoliths circular to broadly elliptical with variable number of slits in distal shield.

Most likely ancestor: Reticulofenestra - at confidence level 3 (out of 5). Data source: e.g. Young 1990.

Search data:
TagsLITHS: placolith, skeletal, elliptical, sub-circular, RIM: rim-narrow, slits, CA: grill, vacant,
CSPH: spherical, monomorphic, V-UNITS: none, R-UNITS: all, c-str, distal shield, prox shield, tube, DETAILS: ca_conjunct, isogyres kinked, isogyres oblique, rim-unicyclic,
MetricsLith size: 3->7µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in mid part of Ionian Stage (52% up, 0.4Ma, in Ionian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Zanclean Stage (69% up, 4.1Ma, in Zanclean stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Gartner, S. (1969b). Correlation of Neogene planktonic foraminifera and calcareous nannofossil zones. Transactions of the Gulf Coast Association of Geological Societies. 19: 585-599. gs

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

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


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Pseudoemiliania compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-12-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1126 Go to Archive.is to create a permanent copy of this page - citation notes



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