Diductius constans


Classification: Mesozoic -> Stephanolithiales -> Parhabdolithaceae -> Diductius -> Diductius constans
Sister taxa: D. constans, D. sp.,

Distinguishing features: Coccoliths with a low, narrow, sloping protolith rim and a wide central area with a multiperforate net that may incorporate spine-bearing axial cross bars. Bicyclic rim image in XPL.


Taxonomy:

Citation: Diductius constans Goy in Goy et al., 1979
Rank: Species

Farinacci & Howe catalog pages: Diductius constans *

Distinguishing features: Coccoliths with a low, narrow, sloping protolith rim and a wide central area with a multiperforate net that may incorporate spine-bearing axial cross bars. Bicyclic rim image in XPL.

Search data:
TagsLITHS: murolith, elliptical, CA: cross-axial, grill, process, V-UNITS: V-prominent, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-bicyclic,
MetricsLith size: 4->7µm;
Sources: Bown 1987 & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

See also: Stradnerlithus clatriatus - similar but simpler construction;

Geological Range:
Last occurrence (top): near top of NJ9 zone (90% up, 169.7Ma, in Bajocian stage). Data source: Bown & Cooper 1998 fig. 4 - secondary events
First occurrence (base): within Early Toarcian Substage (178.24-182.70Ma, base in Toarcian stage). Data source: Bown & Cooper 1998

Plot of occurrence data:

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

    References:

    Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs :: ::

    Bown, P. R. (1987). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology. 38: 1-118. gs :: ::

    Goy, G., Noël, D. & Busson, G. (1979). Les conditions de sédimentation des schistes-carton (Toarcien inf.) du bassin de Paris déduites de l'étude des nannofossiles calcaires et des diagraphies. Documents de Géologie de la Faculté des Sciences de Lyon. 75: 33-57. gs :: ::


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    Diductius constans compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-7-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10376 Go to Archive.is to create a permanent copy of this page - citation notes



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