Zeugrhabdotus blowii


Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Zeugrhabdotus -> Zeugrhabdotus blowii
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: Small (holotype 3.5 µm), unicyclic, bar formed of two transverse units and goes into extinction parallel to polars.


Taxonomy:

Citation: Zeugrhabdotus blowii Lees, 2007
Rank: Species

Farinacci & Howe catalog pages: Zeugrhabdotus blowii *

Distinguishing features: Small (holotype 3.5 µm), unicyclic, bar formed of two transverse units and goes into extinction parallel to polars.


Morphology remarks: "A small species of Zeugrhabdotus with quite low birefringence that has a simple, disjunct bar composed of two elements. The bar is almost invisible at 0 ̊. At 45 ̊, the bar and rim have the same birefringence. Differentiation: This new species is distinguished from other zeugrhabdotids by the simplicity of its bar and by the way in which the bar goes into extinction at 0 ̊. The Jurassic Z. fissus is superficially similar to the new species, but has a bar with higher birefringence and a perforation in the centre of the bar that the new species lacks." [Lees 2007]

Size: Holotype dimensions: L = 3.52μm, W = 2.64μm

Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Lees 2007 (original description)
First occurrence (base): within Turonian Stage (89.77-93.90Ma, base in Turonian stage). Data source: Lees 2007 (original description)

Plot of occurrence data:

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

    References:

    Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs

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

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

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