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. | |||||
Praeprinsius Very small to small (1-4 µm), circular to sub-circular, coccospheres with numerous coccoliths | |||||
Prinsius Small to medium size (3-6 µm), elliptical, central areas narrow, closed or with slit-like opening | |||||
Toweius Typically medium-sized.(5-8 µm), elliptical to circular, central areas typically with a conjunct net and/or bars. | Toweius oztunalii Toweius occultatus Toweius eminens Toweius tovae Toweius serotinus Toweius pertusus Toweius reticulum Toweius selandianus Toweius rotundus Toweius patellus Toweius callosus Toweius magnicrassus Toweius brusselensis Toweius gammation Toweius sp. | ||||
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. | |||||
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:
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.
Original description: Diagnosis.- Oval, subcircular or circular placoliths; interference figure between crossed polarizers is dextrogyre in distal view.
Farinacci & Howe catalog pages: Prinsiaceae *
Morphology:
Phylogenetic relations
Lith size: 1->16µm; |
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:
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 (1): 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 References:
Prinsiaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-11-2024
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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