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. | |||||
Eiffellithales Murolith coccoliths with an upper/outer cycle of clockwise-imbricate V-units and a lower/inner cycle of R-units. | |||||
Stephanolithiales Murolith coccoliths with a distal/outer cycle of non-imbricating elements, i.e., in side view, the sutures are vertical or near-vertical. | |||||
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. | |||||
Syracosphaerales Heterocococcoliths with central area including a cycle of radial laths alternating with rim elements but with tangential c-axis orientations | |||||
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). | |||||
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]. |
Taxonomy:
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; |
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:
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. gsReferences:
Mesozoic Nannoplankton compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-12-2024
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