Nannotax3 - ntax_mesozoic - Podorhabdus grassei

Distinguishing features:
Parent taxon (Podorhabdus): Sub-circular, rim broad; central area spanned by a granular bar supporting a broad, tall, hollow, flaring spine.
This taxon: Broadly elliptical to subcircular podorhabdid with central area spanned by a granular bar supporting a broad, tall, hollow, flaring spine.

Citation: Podorhabdus grassei Noël, 1965

Synonyms:

Discorhabdus jungii Noël, 1965 [cf. Wind & Wise 1977 in Wise & Wind 1977]
Discorhabdus biperforatus Rood Hay & Barnard 1973;
Podorhabdus biperforatus (Rood et al. 1973) Perch-Nielsen 1984 [cf. Wind & Wise 1977 in Wise & Wind 1977]

Variants: Hemipodorhabdus conjugatus Medd 1979 - smaller

Geological Range:
Notes: May range as high as Berriasian in the Pacific ocean (Subzone NK2a) (see Bown, 2005).
Last occurrence (top): within NJ17a subzone (146.27-148.67Ma, top in Tithonian stage). Data source: Bown & Cooper 1998
First occurrence (base): in upper part of NJ8b subzone (70% up, 173.3Ma, in Aalenian stage). Data source: Bown & Cooper 1998 (fig. 4) - secondary events

References:

Barnard, T. & Hay, W. W. (1974). On Jurassic coccoliths: A tentative zonation of the Jurassic of Southern England and North France. Eclogae Geologicae Helvetiae. 67(3): 563-585. gs O

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. (2005c). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs O

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

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

Noël, D. (1965). Sur les Coccolithes du Jurassique Européen et d'Afrique du Nord. Essai de classification des coccolithes fossiles. Éditions du Centre National de la Recherche Scientifique, Paris. 1-209. gs

Perch-Nielsen, K. (1984). Validation of new combinations. INA Newsletter. 6(1): 42-46. gs

Rahman, A. & Roth, P. H. (1992). New calcareous nannofossil taxa of Jurassic and early Cretaceous age from the Oka River region in Central Russia. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 184: 251-277. gs

Rood, A. P., Hay, W. W. & Barnard, T. (1971). Electron Microscope Studies of Oxford Clay Coccoliths. Eclogae Geologicae Helvetiae. 64: 245-272. gs O

Rood, A. P., Hay, W. W. & Barnard, T. (1973). Electron microscope studies of Lower and Middle Jurassic coccoliths. Eclogae Geologicae Helvetiae. 66: 365-382. gs O

Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs O

Zweili, F. (1989). Fossile Coccolithophoriden aus dem Weissensteingebiet. Mitteilungen / Naturforschende Gesellschaft des Kantons Solothurn. 34: 199-213. gs O

Podorhabdus grassei

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