Nannotax3 - ntax_cenozoic

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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&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, elliptical, circular, CA: ca_conjunct, vacant, closed,
CSPH: equant, CROSS-POLARS: V-prominent, R-prominent, rim-bicyclic,

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:

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. See also: customisable plot Parent: Prinsiaceae

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 (1): 427-555. gs

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