Nannotax3 - ntax_mesozoic - Carinolithus

Carinolithus


Classification: ntax_mesozoic -> Podorhabdales -> Calyculaceae -> Carinolithus
Sister taxa: Calyculus, Carinolithus

Distinguishing features:
Parent taxon (Calyculaceae): Elevated placoliths, tube tall and proximal shield reduced; central-area with variable proximal cover.
The distal shield is formed from V-units and the proximal shield from R-units. Commonly observed in side view.

This taxon: Trumpet-shaped coccoliths with small, disc-like proximal shield and high, flaring distal shield.


species arranged by first occurrence (time control age-window is: 0-800Ma)Granddaughter taxa
Carinolithus magharensis
Trumpet-shaped coccoliths with minute, disc-like proximal shield and very narrow stem-like distal shield that flares distally to form a hexagonal structure. Seen in side view, but the distal hexagonal structures are also seen as disarticulated hexaliths.
C. magharensis subsp. magharensis
C. magharensis subsp. minor

Carinolithus superbus
Trumpet-shaped coccoliths with small, disc-like proximal shield and narrow gently widening distal shield that flares distally to a diameter just greater than the proximal disc. Seen in side view.
C. superbus subsp. crassus
C. superbus subsp. superbus

Carinolithus poulnabronei
Species of Carinolithus with a broad, flaring, tube.

Carinolithus sp.
Specimens not identified to species level

Taxonomy:

Citation: Carinolithus Prins in Grün et al., 1974
Rank: Genus
Type species: Carinolithus superbus (Deflandre, 1954) Prins in Grün et al., 1974

Taxonomic discussion:
See Visentin et al. (2021) for detailed discssion of this genus and and morphometric study of the species.

Farinacci & Howe catalog pages: Carinolithus + *

Distinguishing features:
Parent taxon (Calyculaceae): Elevated placoliths, tube tall and proximal shield reduced; central-area with variable proximal cover.
The distal shield is formed from V-units and the proximal shield from R-units. Commonly observed in side view.

This taxon: Trumpet-shaped coccoliths with small, disc-like proximal shield and high, flaring distal shield.


Phylogenetic relations: The succession of species within this genus is discussed in Visentin et al. 2021.

Search data:
TagsLITHS: placolith, circular, rod-shaped, cylindrical, CA: closed, CROSS-POLARS: rim-unicyclic, V-prominent,
MetricsLith size: 7->10µm;
Data source notes: size range of included species
The morphological data given here can be used on the advanced search page. See also these notes

See also: Staurolithites pseudocarinolithus - unrelated Early Cretaceous homoeomorph;

Geological Range:
Last occurrence (top): in mid part of Bathonian Stage (50% up, 167.2Ma, in Bathonian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Toarcian Stage (0% up, 182.7Ma, in Pliensbachian stage). Data source: Total of range of species in this database

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

Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs

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

Visentin, S., Faucher, G. & Erba, E. Mattioli, E. (2021b). Taxonomic revision of the genus Carinolithus (Early - Middle Jurassic) based on morphometric analyses and diagenesis observations: Implications for biostratigraphy and evolutionary trends. Marine Micropaleontology. 162: 1-11. gs


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Carinolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 9-12-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10196 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (1)

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Stefano Visentin (Milano, Italy)

Dear all,

I recently published a paper where I discussed the taxonomy of the genus Carinolithus based on morphometric analyses and diagenesis observations. This resulted in two new subspecies for the taxon Carinolithus superbus and two new subspecies for the taxon Carinolithus magharensis. Additionally the species Carinolithus cantaluppii was rejected as a diagenetic artefact. The reference is here:https://doi.org/10.1016/j.marmicro.2020.101950

Could we add these information to nannotax database (also pictures of the new taxa would be of great help).

Thanks a lot for your job here in nannotax: it is extremely useful.

Stefano

Gravatar
Jeremy Young (Tonbridge, UK)

Hi Stefano

That sounds good - could you send me (jeremy.young@ucl.ac.uk) a preprint copy of your plates - that way we do not infringe Elsevier's copyright, and we can make sure the full quality images get on the site.

cheers

Jeremy

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