Sphenolithus microdelphix


Classification: Coccolithophores -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. heteromorphus group -> Sphenolithus microdelphix
Sister taxa: S. heteromorphus, S. milanetti, S. preasii, S. belemnos, S. pseudoheteromorphus, S. conicus, S. calyculus, S. delphix, S. microdelphix, S. spinula,

Taxonomy:

Citation: Sphenolithus microdelphix Bergen & de Kaenel, in Bergen et al. 2017
Rank: species

Distinguishing features: Like S. delphix, but smaller (<8 µm)

Farinacci & Howe catalog pages: Sphenolithus microdelphix *


Size: Specimen length is less than 8 µm. Length of ten measured specimens: 2.4–6.4 µm; width measured specimens: 2.4– 5.2 µm (holotype: 5.2 µm x 5.0 µm) [Bergen et al 2017]

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CA: process, R-UNITS: R-prominent,
MetricsLith size: 2.5->7µm;
Sources: Bergen et al 2017
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Bergen et al. (2017) record the FAd of S. microdelphix as occurring very close o that of S. delphix but the LAd signifcantly higher, within NN2
Last occurrence (top): in mid part of NN2 zone (50% up, 20.9Ma, in Burdigalian stage). Data source: Bergen et al 2017
First occurrence (base): in upper part of NP25 zone (70% up, 25.1Ma, in Chattian stage). Data source: Bergen et al 2017

Plot of occurrence data:

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

    References:

    Bergen, J. A., de Kaenel, E., Blair, S. A., Boesiger, T. M. & Browning, E. (2017). Oligocene-Pliocene taxonomy and stratigraphy of the genus Sphenolithus in the circum North Atlantic Basin: Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research. 37(2-3): 77-112. gs :: view :: open


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    Sphenolithus microdelphix compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-7-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1612 Go to Archive.is to create a permanent copy of this page - citation notes



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