Zeugrhabdotus blowii


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

Distinguishing features: Unicyclic, small; bar divided longitudinally, darkest at 0°


Taxonomy:

Citation: Zeugrhabdotus blowii Lees, 2007
Rank: Species
Taxonomic discussion: Morphology similar to Z. fissus but the reported ranges are very different  ( Turonian-Campanian vs. Oxfordian-Valangian)

Farinacci & Howe catalog pages: Z. blowii *

Distinguishing features: Unicyclic, small; bar divided longitudinally, darkest at 0°


Morphology: "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

Search data:
TagsLITHS: murolith, ca_disjunct, process, bar, CROSS-POLARS: rim-unicyclic, V-prominent,
MetricsLith size: 3->4µm;
Data source notes: holotype +/-0.5µm
The morphological data given here can be used on the advanced search page. See also these notes

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:

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 V O

Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs V O


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Zeugrhabdotus blowii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-1-2021

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11324 Go to Archive.is to create a permanent copy of this page - citation notes



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