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 (1-2.5 µm) circular to elliptical; central area narrow, tube-elements extended distally to form an elevated flower-like structure.
Futyania petalosa
Futyania sp.

Praeprinsius
Very small to small (1-4 µm), circular to sub-circular, coccospheres with numerous coccoliths
Praeprinsius vegrandis
Praeprinsius tenuiculus

Prinsius
Small to medium size (3-6 µm), elliptical, central areas narrow, closed or with slit-like opening
Prinsius dimorphosus
Prinsius martinii
Prinsius bisulcus
Prinsius sp.

Toweius
Typically medium-sized.(5-8 µm), elliptical to circular, central areas typically with a conjunct net and/or bars.

conventionally placed in the Prinsiaceae
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.

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.

Taxonomy:

Citation: Prinsiaceae Hay & Mohler, 1967 emend. Young & Bown, 1997
taxonomic 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.
Neobiscutum and Hornibrookina are conventionally placed in the Prinsiaceae, but may be unrelated.

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. There is a clear evolutionary lineage from Praeprinsius to Prinsius to Toweius, with i>Futyania a side branch (Romein 1979, Bown et al. 2023).

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 (66.04-67.82Ma, base in Maastrichtian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

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


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Prinsiaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-5-2024

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Short stable 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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