Schizosphaerella punctulata


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

Distinguishing features: 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: Nannopatina grandaeva Stradner 1961
Schizosphaerella astraea Moshkovitz 1979 [cf. Neptune database synonymy] Nipterula sabina Farinacci 1969

Farinacci & Howe catalog pages: Schizosphaerella punctulata * , Nannopatina grandaeva * , Schizosphaerella astraea * , Nipterula sabina *

Distinguishing features: Large globular test with two interlocking sub-hemispherical valves formed from a geometric arrangement of equidimensional crystallites.


Morphology remarks: 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 copmlex.

Geological Range:
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:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Schizosphaerella

    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

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

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

    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

    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

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

    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

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

    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

    Noël, D. (1973). Nannofossiles calcaires de sédiments jurassiques finement laminés. Bulletin du Muséum National d'Histoire Naturelle. 3e serie, 75: 95-156. gs


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    Schizosphaerella punctulata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-9-2019

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