Tranolithus orionatus


Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Tranolithus -> Tranolithus orionatus
Sister taxa: T. bitraversus, T. gabalus, T. incus, T. macleodiae, T. minimus, T. orionatus, T. praeorionatus, T. salillum, T. stemmerikii, T. sp.,

Distinguishing features: Loxolith coccoliths with a transverse structure/bar composed of four lateral struts, a median granular component, and a central hollow spine base. In addition, the coccolith has a proximal grill composed of lateral bars.


Taxonomy:

Citation: Tranolithus orionatus (Reinhardt, 1966a) Reinhardt, 1966b
Rank: Species
Basionym: Discolithus orionatus Reinhardt, 1966a
Synonyms:

Farinacci & Howe catalog pages: Discolithus orionatus * , Tranolithus exiguus + * , Tranolithus manifestus * , Tranolithus phacelosus * , Pontilithus obliquicancellatus *

Distinguishing features: Loxolith coccoliths with a transverse structure/bar composed of four lateral struts, a median granular component, and a central hollow spine base. In addition, the coccolith has a proximal grill composed of lateral bars.


Morphology remarks: Stover’s (1966) description of Tranolithus included three similar species, exiguus, manifestus (type species), and phacelosus, each characterised by a tranverse central area structure composed of four variably-sized blocks or projections. Stover (1966) also described another Tranolithus morphotype as Parhabdolithus? bitraversus. Earlier the same year, Reinhardt (1966a) described a coccolith with similar morphology, as ‘Discolithusorionatus. It appears likely that all five species are conspecific preservational morphotypes, although some size variation may also be involved. This group is demonstrably highly variably in appearance depending on the degree of dissolution or overgrowth; the four blocks are particularly susceptible to overgrowth, and the central structure can display a complete range of morphologies, from small triangular projections into the central area (the exiguus morphotype of Stover, 1966) to four, large, square-shaped blocks which almost fill the central area (the phacelosus morphotype of Stover, 1966 and orionatus morphotype of Reinhardt, 1966a). The manifestus morphotype appears to be a large, moderately overgrown specimen. Well-preserved specimens reveal that the central structure is a transverse bar constructed from four triangular struts and a median, granular component which supports a small, hollow spine base.
On the proximal surface the coccolith has a grill composed of narrow radiating lateral bars (see e.g. T. ‘salillum’ of Crux, 1982, pl. 5.2, figs 13-16; T. ‘salillum’ of Taylor, 1982, pl. 4.4, figs 17-19). This is very diagnostic in EM, and was he defining feature of Gartner's taxon  Pontilithus obliquicancellatus.

Geological Range:
Last occurrence (top): at top of UC17 zone (100% up, 71Ma, in Maastrichtian stage). Data source: Burnett 1998 (zonal marker)
First occurrence (base): at base of BC24 zone (0% up, 110.1Ma, 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: Tranolithus orionatus, synonyms included - Glaukolithus phacelosus; Pontilithus obliquicancellatus; Tranolithus crionatus; Tranolithus orionatus; Tranolithus phacelosus; Zygodiscus phacelosus; space-time plot :: Samples map :: Parent: Tranolithus

    References:

    Black, M. (1968). Taxonomic problems in the study of coccoliths. Palaeontology. 11: 793-813. gs

    Black, M. (1973). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph. 127: 49-112. 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

    Bown, P. R., Gibbs, S. J., Sheward, R., O’Dea, S. & Higgins, D. (2014). Searching for cells: the potential of fossil coccospheres in coccolithophore research. Journal of Nannoplankton Research. 34(special): 5-21. gs

    Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. The University of Kansas Paleontological Contributions. Article 51 (Protista 2): 1-79. gs

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

    Crux, J. A. (1982). Upper Cretaceous (Cenomanian to Campanian) calcareous nannofossils. In, Lord, A. R. (ed.) A Stratigraphical Index of Calcareous Nannofossils. British Micropalaeontological Society Series, Ellis Horwood, Chichester 81-135. 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

    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

    Lambert, B. (1987). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional. Cahiers de Micropaléontologie. 2(2): 33-60. gs

    Lambert, B. (1993). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional (Deuxième Partie). Cahiers de Micropaleontologie. 8(2): 183-225. gs

    Lees, J. A. & Bown, P. R. (2005). Upper Cretaceous calcareous nannofossil biostratigraphy, ODP Leg 198 (Shatsky Rise, Northwest Pacific Ocean). Proceedings of the Ocean Drilling Program. Scientific Results. 198: 1-60. 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

    Perez-Rodriguez, I., Lees, J. A., Larasoaña, J. C., Arz, J. A. & Arenillas, I. (2012). Planktonic foraminiferal and calcareous nannofossil biostratigraphy and magnetostratigraphy of the uppermost Campanian and Maastrichtian at Zumaia, northern Spain. Cretaceous Research. 37: 100-126. gs

    Reinhardt, P. (1966b). Zur Taxonomie und Biostratigraphie des fossilen Nannoplanktons aus dem Malm, der Kreide und dem Alttertiär Mitteleuropas. Freiberger Forschungshefte. C196: 5-109. gs

    Reinhardt, P. (1966a). Fossile Vertreter coronoider und styloider Coccolithen (Family Coccolithaceae Poche 1913). Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 8: 513-524. 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

    Sissingh, W. (1977). Biostratigraphy of Cretaceous calcareous nannoplankton. Geologie en Mijnbouw. 65(1): 37-65. gs

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

    Taylor, R. J. (1982). Lower Cretaceous (Ryazanian to Albian) calcareous nannofossils. In, Lord, A. R. (ed.) A Stratigraphical Index of Calcareous Nannofossils. British Micropalaeontological Society Series, Ellis Horwood, Chichester 40-80. gs

    Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 30(1): 39-56. 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

    Verbeek, J. W. (1977). Calcareous nannoplankton biostratigraphy of Middle and Upper Cretaceous deposits in Tunisia, southern Spain and France. Utrecht Micropaleontological Bulletin. 16: 1-157. gs

    Wise, S. W. (1983). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 71 in the Falkland Plateau region, Southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 481-550. gs


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    Tranolithus orionatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-9-2019

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