Zeugrhabdotus streetiae


Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Zeugrhabdotus -> Zeugrhabdotus streetiae
Sister taxa: Z. acanthus, Z. angelozziae, Z. bicrescenticus, Z. biperforatus, Z. blowii, Z. burolletii, Z. burwellensis, Z. clarus, Z. cooperi, Z. diplogrammus, Z. elegans, Z. embergeri, Z. erectus, Z. fissus, Z. fluxus, Z. howei, Z. kerguelenensis, Z. moulladei, Z. noeliae, Z. petrizzoae, Z. praesigmoides, Z. reticulatus, Z. scutula, Z. sigmoides, Z. simplex, Z. sisyphus, Z. streetiae, Z. trivectis, Z. xenotus, Z. sp.,

Distinguishing features: Large (c. 8.0 µm) Zeugrhabdotus with a broad, bicyclic or diffusely bicyclic rim and a broad, complexely constructed transverse bar. 


Taxonomy:

Citation: Zeugrhabdotus streetiae Bown in Kennedy et al., 2000
Rank: Species

Farinacci & Howe catalog pages: Zeugrhabdotus streetiae *

Distinguishing features: Large (c. 8.0 µm) Zeugrhabdotus with a broad, bicyclic or diffusely bicyclic rim and a broad, complexely constructed transverse bar. 


Morphology remarks: Large (c. 8.0 µm) Zeugrhabdotus with a broad, bicyclic or diffusely bicyclic rim and a broad, complexely constructed transverse bar. When oriented parallel to the polarising directions, the bar appears granular but weakly birefringent and broadens markedly towards the rim; in this orientation the most birefringent parts of the bar may appear as an acute diagonal cross. When oriented at 45° to the polarising directions, the bar is dark at one focus level and bright protrusions from the inner rim cycle are visible; if the focus level is shifted, the bar becomes birefringent and appears as a bright rectangle crossed by diagonal extinction lines. In PC, the bright inner cycle is only seen clearly at either end of the bar.

Size: Length 7.1-9.0 µm

Geological Range:
Last occurrence (top): within Late Albian Substage (100.50-107.59Ma, top in Albian stage). Data source: Kennedy et al., 2000
First occurrence (base): within Late Aptian Substage (112.95-122.98Ma, base in Aptian stage). Data source: Kennedy et al., 2000

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: Zeugrhabdotus streetiae, synonyms included - Zeugrhabdotus streetiae; space-time plot :: Samples map :: Parent: Zeugrhabdotus

    References:

    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

    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


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    Zeugrhabdotus streetiae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-9-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11346 Go to Archive.is to create a permanent copy of this page - citation notes



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