Axopodorhabdus albianus


Classification: Mesozoic -> Podorhabdales -> Axopodorhabdaceae -> Axopodorhabdus -> Axopodorhabdus albianus
Sister taxa: A. albianus, A. atavus, A. cylindratus, A. dietzmannii, A. rahla, A. sp.,

Distinguishing features: Axopodorhabdus with 3-tiered shield and axial cross bars that flare where they join the rim. Highly diagnostic XPL image comprising birefringent cross bars with median extinction lines that darken at 45 degrees.


Taxonomy:

Citation: Axopodorhabdus albianus (Black, 1967) Wind & Wise 1983
Rank: Species
Basionym: Podorhabdus albianus Black, 1967
Variants:
Synonyms:
Notes & discussion: The combination was initially proposed by Wind & Wise, in Wise & Wind (1977) but the original publication was not cited directly hence the proposal was technically invalid and so was proposed again, validly, in  Wind & Wise 1983.

Podorhabdus orbiculofenestrus is included here in the synonymy of A. albianus, following Thierstein (1974). By contrast Verbeek (1977) regarded it a synonym of A. dietzmannii but the holotype of  orbiculofenestrus (Gartner's pl.25 fig.25) shows the features of A. albianus.

Zygolithus biramiculatus
Stover 1966 has been suggested as a possible senior synonym by Corbett & Watkins 2014. However, whilst the drawing by Stover strongly resembles A. albianus Black 1967 the holotype LM images are appear to be of A. dietzmannii Reinhardt 1965.

Farinacci & Howe catalog pages: Podorhabdus albianus * , Podorhabdus fusiformis * , Prediscosphaera orbiculofenestra * , Podorhabdus gracilis *

Distinguishing features: Axopodorhabdus with 3-tiered shield and axial cross bars that flare where they join the rim. Highly diagnostic XPL image comprising birefringent cross bars with median extinction lines that darken at 45 degrees.


Morphology remarks: Black (1972) noted that this species has "three layers" in the rim. This is also clear in SEMs (unpubl. obs. JRY).  A. dietzmannii is similar but separated by several characters - see discussion on A. dietzmannii page.

Geological Range:
Last occurrence (top): at top of UC5a subzone (100% up, 94.2Ma, in Cenomanian stage). Data source: Burnett 1998 (subzonal marker)
First occurrence (base): at base of BC25 zone (0% up, 108.3Ma, in Albian stage). Data source: Bown et al. 1998 - zonal marker

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Axopodorhabdus albianus, synonyms included - Axopodorhabdus albianus; Podorhabdus albianus; Podorhabdus orbiculofenestrus; Prediscosphaera orbiculofenestra; space-time plot :: Samples map :: Parent: Axopodorhabdus

    References:

    Black, M. (1967). New names for some coccolith taxa. Proceedings of the Geological Society of London. 1640: 139-145. gs

    Black, M. (1972). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 1). Palaeontographical Society Monograph. 126: 1-48. gs

    Bown, P. R. (2001). Calcareous nannofossils of the Gault, Upper Greensand and Glauconitic Marl (Middle Albian-Lower Cenomanian) from the BGS Selborne boreholes, Hampshire. Proceedings of the Geologists' Association. 112: 223-236. 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

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

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

    Gale, A. S., Kennedy, W. J., Burnett, J. A., Caron, M. & Kidd, B. E. (1996). The Late Albian to Early Cenomanian succession at Mont Risou, near Rosans (Drôme, SE France): an integrated study (ammonites, inoceramids, planktonic foraminifera, nannofossils, oxygen and carbon isotopes). Cretaceous Research. 17: 515-606. gs

    Gale, A. S. et al. (2011). The uppermost Middle and Upper Albian succession at the Col de Palluel, Hautes-Alpes, France: An integrated study (ammonites, inoceramid bivalves, planktonic foraminifera, nannofossils, geochemistry, stable oxygen and carbon isotopes, cyclostratigraphy). Cretaceous Research. 32: 59-130. gs

    Hardas, P. & Mutterlose, J. (2006). Calcareous nannofossil biostratigraphy of the Cenomanian/Turonian boundary interval of ODP Leg 207 at the Demerara Rise. Revue de Micropaleontologie. 49(3): 165-179. gs

    Jeremiah, J. (1996). A proposed Albian to Lower Cenomanian nannofossil biozonation for England and the North Sea Basin. Journal of Micropalaeontology. 15(97-129): -. gs

    Kennedy, W. J. et al. (2000). Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pre _-Guittard, Arnayon (Drome), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage. Cretaceous Research. 21: 591-720. gs

    Linnert, C., Mutterlose, J. & Erbacher, J. (2010). Calcareous nannofossils of the Cenomanian/Turonian boundary interval from the Boreal Realm (Wunstorf, northwest Germany). Marine Micropaleontology. 74: 38-58. gs

    Roth, P. H. & Thierstein, H. R. (1972). Calcareous nannoplankton: Leg 14 of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 12: 546-559. gs

    Stover, L. E. (1966). Cretaceous coccoliths and associated nannofossils from France and the Netherlands. Micropaleontology. 12: 133-167. gs

    Thierstein, H. R. (1974). Calcareous nannoplankton - Leg 26, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 26: 619-667. gs

    Varol, O. & Girgis, M. (1994). New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen. 192: 221-253. gs

    Wind, F. H. & Wise, S. W. (1983). Correlation of upper Campanian-lower Maestrichtian calcareous nannofossil assemblages in drill and piston cores from the Falkland Plateau, southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 551-563. gs

    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


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

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10049 Go to Archive.is to create a permanent copy of this page - citation notes



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