Nannotax3 - ntax_mesozoic - Calyculus cribrum

Calyculus cribrum


Classification: ntax_mesozoic -> Podorhabdales -> Calyculaceae -> Calyculus -> Calyculus cribrum
Sister taxa: C. cribrum, C. depressus ⟩⟨ C. noeliae ⟩⟨ C. hommerili, C. serrai ⟩⟨ C. absolutus, C. derivatus, C. magnus, C. sp.

Distinguishing features:
Parent taxon (Calyculus): High, broad, flaring distal-shield composed of radial, non-imbricating elements, and a proximal-shield which is often reduced to a simple, narrow cycle of elements; central-area structures are highly variable, including numerous bars, concentric structures, nets and grills.
This taxon: Elliptical Calyculus ; rim moderately elevated; central area with axial cross,concentric lozenge.


Taxonomy:

Citation: Calyculus cribrum Noël, 1973
Rank: Species
Synonyms: Calyculus pugnatum Grun & Zweili, in Grün et al. 1974 [cf. Bown 1987]

Farinacci & Howe catalog pages: C. cribrum + * , C. pugnatum *

Distinguishing features:
Parent taxon (Calyculus): High, broad, flaring distal-shield composed of radial, non-imbricating elements, and a proximal-shield which is often reduced to a simple, narrow cycle of elements; central-area structures are highly variable, including numerous bars, concentric structures, nets and grills.
This taxon: Elliptical Calyculus ; rim moderately elevated; central area with axial cross,concentric lozenge.


Morphology: Central area structure is identical to that seen in Sollasites lowei.

Search data:
TagsLITHS: placolith, elliptical, hollow, CA: concentric-ring(s), cross-axial, ca_disjunct, CROSS-POLARS: rim-unicyclic, V-prominent,
MetricsLith size: 5->7µm;
Data source notes: Bown (1987) +/- 0.5 µm
The morphological data given here can be used on the advanced search page. See also these notes

See also: Sollasites lowei - putative ancestral coccolith, with very similar central structure;

Geological Range:
Last occurrence (top): within NJ9 zone (169.69-170.10Ma, top in Bajocian stage). Data source: Bown & Cooper 1998
First occurrence (base): within Late Pliensbachian Substage (182.70-187.56Ma, base in Pliensbachian stage). Data source: Bown & Cooper 1998

Plot of occurrence data:

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

Crux, J. A. (1987a). Concerning dimorphism in Early Jurassic coccoliths and the origin of the genus Discorhabdus Noël 1965. Abhandlungen der Geologischen Bundesanstalt. 39: 51-55. gs V O

Grün, W., Prins, P. & Zweili, F. (1974). Coccolithophoriden aus dem Lias epsilon von Holzmaden (Deutschland). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 147: 294-328. gs

Hamilton, G. B. (1977). Early Jurassic calcareous nannofossils from Portugal and their biostratigraphic use. Eclogae Geologicae Helvetiae. 70: 575-597. gs V O

Mattioli, E. (1996). New calcareous nannofossil species from the Early Jurassic of Tethys. Rivista Italiana di Paleontologia e Stratigrafia. 102(3): 397-412. gs V O

Noël, D. (1973). Nannofossiles calcaires de sédiments jurassiques finement laminés. Bulletin du Muséum National d'Histoire Naturelle. 75: 95-156. gs V O


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Calyculus cribrum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-11-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10185 Go to Archive.is to create a permanent copy of this page - citation notes



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