Zeugrhabdotus sigmoides


Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Zeugrhabdotus -> Zeugrhabdotus sigmoides
Sister taxa: Z. blowii, Z. burolletii, 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. burwellensis, Z. kerguelenensis, 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: Bicyclic, medium-large; bar complex; bright inner rim broadest where it meets bridge, very narrow tends of central area.


Taxonomy:

Citation: Zeugrhabdotus sigmoides (Bramlette & Martini, 1964) Bown & Young, 1997
Rank: Species
Basionym: Zygodiscus sigmoides Bramlette & Martini, 1964

Farinacci & Howe catalog pages: Zygodiscus sigmoides *

Distinguishing features: Bicyclic, medium-large; bar complex; bright inner rim broadest where it meets bridge, very narrow tends of central area.

Search data:
TagsLITHS: murolith, CA: process, bar, V-UNITS: V-prominent, DETAILS: ca_disjunct, rim-bicyclic,
MetricsLith size: 8->11µm;
Sources: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of NP9 zone (100% up, 55.9Ma, in Ypresian stage). Data source: Lees & Bown 2005 - consistently present to end Cret
First occurrence (base): within UC15d subzone (75.93-76.82Ma, base in Campanian stage). Data source: Burnett 1998

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:

    Bown, P. R. & Young, J. R. (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 21-36. gs :: view :: open

    Bramlette, M. N. & Martini, E. (1964). The great change in calcareous nannoplankton fossils between the Maestrichtian and Danian. Micropaleontology. 10(2): 291-322. gs :: ::

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

    Pospichal, J. J. & Wise, S. W. (1990b). Maestrichtian calcareous nannofossil biostratigraphy of Maud Rise ODP leg 113 sites 689 and 690, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 465-487. gs :: view :: open

    Pospichal, J. J. & Wise, S. W. (1990a). Calcareous nannofossils across the K/T boundary, ODP hole 690C, Maud Rise, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 515-532. gs :: view :: open

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

    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 :: view :: open


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    Zeugrhabdotus sigmoides compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 7-6-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11342 Go to Archive.is to create a permanent copy of this page - citation notes



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