Nannotax3 - ntax_mesozoic - Schizosphaerella punctulata

Schizosphaerella punctulata


Classification: ntax_mesozoic -> Mesozoic non–coccoliths -> Schizosphaerellaceae -> Schizosphaerella -> Schizosphaerella punctulata
Sister taxa: S. punctulata, S. sp.

Distinguishing features:
Parent taxon (Schizosphaerella): Large globular test with two interlocking sub-hemispherical valves formed from a geometric arrangement of equidimensional crystallites.
This taxon: Large globular test with two interlocking sub-hemispherical valves formed from a geometric arrangement of equidimensional crystallites.


Taxonomy:

Citation: Schizosphaerella punctulata Deflandre & Dangeard, 1938
Rank: Species
Synonyms:
Variants: Peti et al. (2021) differentiated three size-based varietes of S. punctulata, and argued based on statisitcal analysis that these were separate taxa.

Farinacci & Howe catalog pages: S. punctulata * , N. grandaeva * , S. astraea * , N. sabina *

Distinguishing features:
Parent taxon (Schizosphaerella): Large globular test with two interlocking sub-hemispherical valves formed from a geometric arrangement of equidimensional crystallites.
This taxon: Large globular test with two interlocking sub-hemispherical valves formed from a geometric arrangement of equidimensional crystallites.


Morphology:

Can be common, but often seen as broken pieces. The wall has a fine, granular appearance in XPL. The wall structure of S. punctulata is documented in impressive detail by Kalin (1980) and is remarkably complex.

Size:


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: nannolith-other, circular, hollow,
Lith size: 8->12µm;
Data source notes: Bown 1987
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Peti et al. (2017) described major size changes through time in Schizosphaerella and Peti e tal. (2021) inteetedthese as due to flutuating ratios of three different-sized taxa.
Last occurrence (top): within Kimmeridgian Stage (152.06-157.25Ma, top in Kimmeridgian stage). Data source: Bown & Cooper 1998
First occurrence (base): at base of NJ1 zone (0% up, 201.1Ma, in Hettangian stage). Data source: Bown & Cooper 1998 (fig 4) - zonal event

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. (1987a). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology. 38: 1-118. gs

Bown, P. R., Cooper, M. K. E. & Lord, A. R. (1988). A calcareous nannofossil biozonation scheme for the early to mid Mesozoic. Newsletters on Stratigraphy. 20: 91-114. gs V O

Crux, J. A. (1987b). Early Jurassic calcareous nannofossil biostratigraphic events. Newsletters on Stratigraphy. 17: 79-100. gs V O

Deflandre, G. & Dangeard, L. (1938). Schizosphaerella, un nouveau microfossile méconnu du Jurassique moyen et supérieur. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences, Paris. 207: 1115-1117. gs V O

Farinacci, A. (1969b). The smallest planktonic calcareous forms of Jurassic micrites. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva 1967. E. J. Brill, Leiden 224-228. gs

Grün, W. & Zweili, F. (1980). Das kalkige Nannoplankton der Dogger-Malm-Grenze im Berner Jura bei Liesberg (Schweiz). Jahrbuch der Geologischen Bundesanstalt. 123: 231-341. gs V O

Hamilton, G. B. (1977). Early Jurassic calcareous nannofossils from Portugal and their biostratigraphic use. Eclogae Geologicae Helvetiae. 70: 575-597. gs O

Kalin, O. (1980). Schizosphaerella punctulata Deflandre & Dangeard : wall ultrastructure and preservation in deeper-water carbonate sediments of the Tethyan Jurassic. Eclogae Geologicae Helvetiae. 73(3): 983-1008. gs O

Medd, A. W. (1979). The Upper Jurassic coccoliths from the Haddenham and Gamlingay boreholes (Cambridgeshire, England). Eclogae Geologicae Helvetiae. 72: 19-109. gs O

Moshkovitz, S. (1979). On the distribution of Schizosphaerella punctulata Deflandre & Deflandre Rigaud and Schizosphaerella atsraea n. sp. in the Liassic section of Stowell Park Borehole (Gluoucestershire) and in some other Jurassic localities of England. Eclogae Geologicae Helvetiae. 72(2): 455-465. gs V O

Noël, D. (1973). Nannofossiles calcaires de sédiments jurassiques finement laminés. Bulletin du Muséum National d'Histoire Naturelle. 75 [1972]: 95-156. gs V O

Peti, L. et al. (2017). Sinemurian–Pliensbachian calcareous nannofossil biostratigraphy and organic carbon isotope stratigraphy in the Paris Basin: Calibration to the ammonite biozonation of NW Europe. Palaeogeography Palaeoclimatology Palaeoecology. 468: 142-161. gs

Peti, L., Thibault, N., Korte, C., Ullmann, C. V., Cachão, M. & Fibæk, M. (2021). Environmental drivers of size changes in Lower Jurassic Schizosphaerella spp. Marine Micropaleontology. 168: 1-20. gs


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Schizosphaerella punctulata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-12-2022

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