Nannotax3 - ntax_cenozoic - Pseudoemiliania

Citation: Pseudoemiliania Gartner, 1969

Type species: Pseudoemilinia lacunosa Kamptner 1963 ex Gartner 1969

Synonyms:

Ellipsoplacolithus Kamptner 1963 (invalid)
Salisia Varol 2004 - alternative name proposed on the assumption that Pseudoemiliania was invalid
Vonsalisia Varol 2019 - replacement name for Salisia (which was a junior homnym of plant genus)

Taxonomic 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:
Parent taxon (Noelaerhabdaceae): Heterococcoliths with Reticulofenestra-type structure, V-units vestigal, R-units forming grill, both shields, and two-layered tube
This taxon: With slits between some of the distal shield elements

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.

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

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 V O

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

Varol, O. (2019). Vonsalisia Varol nom nov pro Salisia Varol 2004 non Lindley 1839. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291(2): 229-230. 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

Daughter taxa (time control age-window is: 0-800Ma)
				Pseudoemiliania lacunosa Circular to sub-circular with >12 slits, length >4µm
				Pseudoemiliania ovata Elliptical and with <12 slits in the distal shield
				Pseudoemiliania sp. Specimens which cannot be assigned to established species

Pseudoemiliania

References:

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