Microrhabdulus helicoideus


Classification: Mesozoic -> Nannoliths inc sedis -> Microrhabdulaceae -> Microrhabdulus -> Microrhabdulus helicoideus
Sister taxa: M. belgicus, M. decoratus, M. helicoideus, M. undosus, M. sp.,

Distinguishing features: Microrhabdulus tapering toward both ends and with spiral structure.


Taxonomy:

Citation: Microrhabdulus helicoideus Deflandre, 1959
Rank: Species
Variants:

Microrhabdulinus tortus Stover (1966) - described as similar to M. helicoideus but more parallel-sided and with lower angle spiral

Synonyms:

Lithraphidites helicoideus; Microrhabdulus? elongatus Gartner 1968 [cf. Neptune database synonymy]

Farinacci & Howe catalog pages: Microrhabdulus helicoideus * , Microrhabdulus elongatus * , Microrhabdulinus tortus * ,

Distinguishing features: Microrhabdulus tapering toward both ends and with spiral structure.


Morphology remarks:

Gartner (1967) recorded it as frequently being terminated by a disk at one end.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): within Coniacian Stage (86.26-89.77Ma, base in Coniacian stage). Data source: Burnett 1998

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: Microrhabdulus helicoideus, synonyms included - Lithraphidites helicoideus; Microrhabdulus elongatus; Microrhabdulus helicoideus; space-time plot :: Samples map :: Parent: Microrhabdulus

    References:

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

    Deflandre, G. (1959). Sur les nannofossiles calcaires et leur systématique. Revue de Micropaléontologie. 2: 127-152. gs

    Gartner, S. (1968). Coccoliths and related calcareous nannofossils from Upper Cretaceous deposits of Texas and Arkansas. The University of Kansas Paleontological Contributions. Article 48 (Protista 1): 1-56. gs

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


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    Microrhabdulus helicoideus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10670 Go to Archive.is to create a permanent copy of this page - citation notes



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