Nannotax3 - ntax_cenozoic - Prinsius Nannotax3 - ntax_cenozoic - Prinsius

Prinsius


Classification: ntax_cenozoic -> Isochrysidales -> Prinsiaceae -> Prinsius
Sister taxa: Futyania, Praeprinsius, Prinsius, Toweius ⟩⟨ Neobiscutum, Hornibrookina

Daughter taxa (time control age-window is: 0-800Ma)
Prinsius dimorphosus
Very small, elliptical to subcircular placoliths with narrow to closed central area.
Prinsius martinii
Small (<5.5µm), elliptical placoliths with conspicuous tube cycle and closed centre.
Prinsius bisulcus
Medium sized, elliptical placoliths with conspicuous tube cycle and closed centre. Two ‘grooves’ may be conspicuous along the longitudinal axis.
Prinsius sp.
Specimens which cannot be assigned to any established species

Taxonomy:

Citation: Prinsius Hay and Mohler, 1967
taxonomic rank: Genus
Type species: Prinsius bisulcus (Stradner, 1963) Hay & Mohler, 1967 [Coccolithus]
Synonyms: Praeprinsius Varol & Jakubowski 1989 - we do not regard it as useful to subdivide the short-lived genus Prinsius into Prinsius and Praeprinsius
Taxonomic discussion: A number of different early, small species have been described (P. africanus, P. tenuiculus, P. rosenkrantzii), but usage can be inconsistent. Some authors group these smaller, early representatives within the separate genus Praeprinsius (Varol & Jakubowski, 1989).

Distinguishing features:
Parent taxon (Prinsiaceae): 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.
This taxon: Small to medium size (3-6 µm), elliptical, central areas narrow, closed or with slit-like opening

Farinacci & Howe catalog pages: Prinsius + * , Praeprinsius *

Most likely ancestor: Praeprinsius - at confidence level 5 (out of 5). Data source: Bown et al. 2023, fig.8.
Likely descendants: Toweius; plot with descendants

Search data:
LITHS: placolith, circular, elliptical, CA: ca_conjunct, vacant, closed,
CSPH: equant, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 2->7µm;
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 NP9 zone (100% up, 55.9Ma, in Ypresian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP1 zone (65.47-66.04Ma, base in Danian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

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

Varol, O. & Jakubowski, M. (1989). Some new nannofossil taxa. INA Newsletter. 11(1): 24-29. gs


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Prinsius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-3-2024

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1119 Go to Archive.is to create a permanent copy of this page - citation notes
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