Chiphragmalithus


Classification: ntax_cenozoic -> Zygodiscales -> Zygodiscaceae -> Chiphragmalithus
Sister taxa: Lophodolithus, Neochiastozygus, Zygodiscus ⟩⟨ Chiphragmalithus, Isthmolithus, Neococcolithes, Nannotetrina

Daughter taxa (time control age-window is: 0-800Ma)
Chiphragmalithus acanthodes
Broadly elliptical Chiphragmalithus.
Chiphragmalithus armatus
Narrowly elliptical Chiphragmalithus. Bars clearly higher then the rim.
Chiphragmalithus barbatus
Subcircular to square Chiphragmalithus.
Chiphragmalithus calathus
Sub-circular to broadly-elliptical, with elevated rim
Chiphragmalithus muzylevii

Chiphragmalithus vandenberghei
Large, tall, robust Ciphragmalithus species, broadly elliptical with protruding irregular spines, H-shaped central structure
Chiphragmalithus sp.
Specimens which cannot be assigned to any established species

Taxonomy:

Citation: Chiphragmalithus Bramlette & Sullivan, 1961
Rank: Genus
Type species: Chiphragmalithus calathus Bramlette and Sullivan 1961
Taxonomic discussion: Often seen in side view.

Distinguishing features: Muroliths with very high wall (similar to coccolith width) and well-developed central-area cross. V-unit cycle dominates and results in a moderately birefringent unicyclic LM image.

Farinacci & Howe catalog pages: Chiphragmalithus *


Size: Mostly medium to large (6-10 µm across) but appear larger because they are thick blocky structures, and can be very large (up to 18 µm for C. vandenberghi)

Search data:
TagsLITHS: murolith, asymmetric, circular, elliptical, CA: diagonal cross, CROSS-POLARS: rim-unicyclic, V-prominent,
MetricsLith size: 6->18µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Short ranging group, restricted to NP12 (Perch-Nielsen, 1985b).
Last occurrence (top): in lower part of Lutetian Stage (23% up, 46.3Ma, in Lutetian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Ypresian Stage (22% up, 54.2Ma, in Ypresian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs

Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gs


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Chiphragmalithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-4-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=281 Go to Archive.is to create a permanent copy of this page - citation notes



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