Nannotax3 - ntax_cenozoic

Nannotax3 - ntax_cenozoic - Prinsiaceae Nannotax3 - ntax_cenozoic - Prinsiaceae

Prinsiaceae

Classification: ntax_cenozoic -> Isochrysidales -> Prinsiaceae
Sister taxa: Noelaerhabdaceae, Prinsiaceae, Isochrysidaceae

Daughter taxa (time control age-window is: 0-800Ma)		Granddaughter taxa
	typical Prinsiaceae
	Futyania Very small circular to elliptical placoliths with narrow central area and tube-elements extended distally to form an elevated flower-like distal structure.	Futyania petalosa Futyania sp.
	Neobiscutum Very small to small placoliths with closed or narrow central areas. Shields are dark in XPL with bright tube cycle.	Neobiscutum parvulum Neobiscutum romeinii Neobiscutum sp.
	Prinsius Prinsiacean placoliths with narrow central areas that are closed or have a narrow opening that may be spanned by a narrow plate/net. Typically very small to medium sized.	Prinsius dimorphosus Prinsius tenuiculus Prinsius martinii Prinsius bisulcus Prinsius sp.
	Toweius Elliptical to circular prinsiacean placoliths with central areas that are typically spanned by a proximal net and/or distal conjunct nets or bars. Typically medium sized.	Toweius serotinus Toweius pertusus Toweius tovae Toweius eminens Toweius occultatus Toweius reticulum Toweius selandianus Toweius rotundus Toweius patellus Toweius callosus Toweius magnicrassus Toweius brusselensis Toweius gammation Toweius sp.
	conventionally placed in the Prinsiaceae
	Hornibrookina Elliptical placoliths with bicyclic distal shields with raised tube cycle and central area grill formed from robust bars.	Hornibrookina australis Hornibrookina elegans Hornibrookina indistincta Hornibrookina teuriensis Hornibrookina weimerae Hornibrookina gracilis Hornibrookina sp.

Romein 1979 fig38.png

Taxonomy:

Citation: Prinsiaceae Hay & Mohler, 1967 emend. Young & Bown, 1997

Rank: Family

Type species: Prinsius

Taxonomic discussion: Toweius coccoliths are larger than Prinsius, with wider central areas and therefore more clearly visible central area nets in LM. Similarly, Futyania coccoliths are similar to Prinsius but have distally elevated tube elements.

Distinguishing features:
Parent taxon (Isochrysidales): 2N: Mostly placolith heterococcoliths with R-unit dominant. Non-motile
N: non-calcifying, motile, with vestigial haptonema.
This taxon: Placoliths with R-units forming the lower layer of proximal shield, inner tube and middle tube; V-units forming an upper layer to the proximal shield, outermost tube and the distal shield. In LM they display a dark outer cycle and brighter inner cycle. Central-area structures are conjunct, formed from the R-units.

Farinacci & Howe catalog pages: Prinsiaceae [no catalog entry yet]

Morphology:

Typically small to medium sized placoliths with R-units forming the proximal shield-element and two tube-elements, and V-units forming an upper layer to the proximal shield, an outermost tube and the distal shield. In LM they display a dark outer cycle and brighter inner cycle. Central-area structures are conjunct, being formed from either the central-area elements or the inner tube-elements of the proximal shield.

Phylogenetic relations

Toweius gave rise to Reticulofenestra by loss of the V-units - the middle tube cycle of Prinsiaceae forms the outer tube of reticulofenestrids and extends to form the distal shield - see Gallagher (1989) and Young (1989). The similarity of the structures are much clearer in proximal view than distal view.

Search data:

Lith size: 1->16µm;

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of NP15 zone (100% up, 42.9Ma, in Lutetian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within CC26 zone (66.04-67.84Ma, base in Maastrichtian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Isochrysidales

References:

Gallagher, L. T. (1989). Reticulofenestra : A critical review of taxonomy, structure and evolution. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series . 41-75. gs O

Hay, W. W. & Mohler, H. P. (1967). Calcareous nannoplankton from Early Tertiary rocks at Point Labau, France and Paleocene-Early Eocene correlations. Journal of Paleontology. 41(6): 1505-1541. gs

Perch-Nielsen, K. (1985). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gs

Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. gs O

Young, J. R. & Bown, P. R. (1997). Cenozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 36-47. gs

Young, J. R. (1989). Observations on heterococcolith rim structure and its relationship to developmental processes. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series . 1-20. gs

Prinsiaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-11-2023

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Short stables page link: https://mikrotax.org/Nannotax3/index.php?id=1118 Go to Archive.is to create a permanent copy of this page - citation notes

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