Chiphragmalithus


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

Daughter taxa: (blue => in age window 0-800Ma)
Broadly elliptical Chiphragmalithus.
Narrowly elliptical Chiphragmalithus. Bars clearly higher then the rim.
Subcircular to square Chiphragmalithus.
Sub-circular to broadly-elliptical, with elevated rim

Large, tall, robust Ciphragmalithus species, broadly elliptical with protruding irregular spines, H-shaped central structure
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
Notes & 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, reniform, RIM: rim-high, outer wall acw-imbricate, rim-edge serrated, spine(s), CA: cross, cross-diagonal-symmetric, diagonal cross,
CSPH: not known, V-UNITS: c-str, rim, V-prominent, R-UNITS: none, DETAILS: rim-unicyclic,
MetricsLith size: 6->18µm;
Sources:
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(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: 5-4-2020

Taxon Search:
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Short stable page link: http://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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