Nannotax3 - ntax_mesozoic - ntax_mesozoic Nannotax3 - ntax_mesozoic - ntax_mesozoic

Mesozoic Nannoplankton


Classification: ntax_mesozoic
Sister taxa:

Distinguishing features:
Parent taxon (images):
This taxon: Mesozoic nannofossils - Cenozoic and extant taxa are in a separate module


Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Heterococcoliths
Arkhangelskiales
Tiered placoliths with 3-5 closely-appressed shields.
Arkhangelskiellaceae
Kamptneriaceae

Eiffellithales
Murolith coccoliths with an upper/outer cycle of clockwise-imbricate V-units and a lower/inner cycle of R-units. 


Chiastozygaceae
Eiffellithaceae
Rhagodiscaceae

Stephanolithiales
Murolith coccoliths with a distal/outer cycle of non-imbricating elements, i.e., in side view, the sutures are vertical or near-vertical.
Parhabdolithaceae
Stephanolithiaceae

Podorhabdales
Placolith (or modified placolith) coccoliths showing little or no imbrication. Typically, V-units form distal shield, R-units form proximal shield.
Axopodorhabdaceae
Biscutaceae
Calyculaceae
Cretarhabdaceae
Mazaganellaceae
Prediscosphaeraceae
Tubodiscaceae

Watznaueriales
Placolith (or modified placolith) coccoliths with a distal cycle of clockwise-imbricating elements. R-units well developed, forming proximal and distal shield elements with opposite senses of imbrication; V-units typically form a narrow distal cycle near the inner edge of the shield.
Watznaueriaceae

Syracosphaerales
Heterocococcoliths with central area including a cycle of radial laths alternating with rim elements but with tangential c-axis orientations
Calciosoleniaceae
Syracosphaeraceae

Heterococcoliths inc sedis
Heterococcolith genera which do not show characteristic features of any of the well-established families.
Papposphaeraceae
Unidentified Mesozoic heterococcoliths
globular inc sedis
muroliths inc sedis
placoliths inc sedis
planoliths inc sedis

Holococcoliths & Nannoliths
Holococcoliths
Coccoliths formed of minute (ca 0.1µm) rhombohedral micro-crystals. Often a life-cycle stage with heterococcolith counterpart(s).
Common genera
Rarer genera

Braarudosphaerales
Nannoliths formed of multiple layers of thin elements, arranged with rotational symmetry, and showing tangential c-axis orientations.
Braarudosphaeraceae
Transitional genera
Nannoconaceae
Polycyclolithaceae
Other nannoliths with tangential c-axes

Nannoliths inc sedis
Nannofossils not obviously homologous with heterococcoliths, holococcoliths, or braarudosphaeralids
Goniolithaceae
Eoconusphaeraceae
Lapideacassaceae
Microrhabdulaceae
Nannoliths inc sed - radiate multielement
Nannoliths inc sed - other

Mesozoic non–coccoliths
Calcispheres and other non-coccoliths found in nannofossil preps. Some taxa previously placed here have been moved to the calcareous dinoflagellates pages [Feb 2017]. 
Carnicalyxia
Cassianospica
Prinsiosphaera
Schizosphaerellaceae

Taxonomy:

Taxonomic discussion: The Cretaceous/Paleogene extinctions had a massive effect on calcareous nannofossils with virtually all common species becoming extinct, hence it is convenient to treat Mesozoic and Cenozoic nannoplankton separately. They are not, however, phylogenetically separate groups since there are significant common features between them (e.g. V and R mode calcification in heterococcoliths, Young et al. 1992), and since it is commonly accepted that the Cenozoic orders each originated, separately, from Mesozoic precursors (e.g. Perch-Nielsen 1979, Medlin et al. 2008, Bown et al. 2017).
The most important overviews of Mesozoic nannofossils are given by Perch-Nielsen (1985) and in the various chapters in Bown (1998). In addition Bown & Young (1997) introduce the taxonomy used in Bown (1998), and we largely follow that taxonomy here.

Farinacci & Howe catalog pages:

Distinguishing features:
Parent taxon (images):
This taxon: Mesozoic nannofossils - Cenozoic and extant taxa are in a separate module

Search data:
Lith size: 0->0µm;
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 (100% up, 0Ma, in "Holocene" stage). Data source: Total of ranges of the species in this database
First occurrence (base): within (-Ma, base in "Holocene" stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 34-85. gs O

Bown, P. R. & Young, J. R. (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 21-36. gs

Bown, P. R. (1998b). Triassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 29-33. gs

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O

Bown, P. R., Lees, J. A. & Young, J. R. (2017). On the Cretaceous origin of the Order Syracosphaerales and the genus Syracosphaera. Journal of Micropalaeontology. 36(2): 153-165. gs

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O

Medlin, L. K., Sáez, A. G. & Young, J. R. (2008). A molecular clock for coccolithophores and implications for selectivity of phytoplankton extinctions across the K/T boundary. Marine Micropaleontology. 67(1-2): 69-86. gs

Perch-Nielsen, K. (1979). Calcareous nannofossils from the Cretaceous between the North Sea and the Mediterranean. In, Weidmann, J. (ed.) Aspekte der Kreide Europas. International Union of Geological Sciences Series A . 6: 223-272. gs O

Perch-Nielsen, K. (1985). Mesozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge (1): 329-426. gs

Young, J. R., Didymus, J. M., Bown, P. R., Prins, B. & Mann, S. (1992). Crystal assembly and phylogenetic evolution in heterococcoliths. Nature. 356: 516-518. gs


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Mesozoic Nannoplankton compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-12-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10649 Go to Archive.is to create a permanent copy of this page - citation notes
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