Calciosolenia


Classification: Mesozoic -> Syracosphaerales -> Calciosoleniaceae -> Calciosolenia
Sister taxa: Calciosolenia,

Distinguishing features: Rhombic; rim bicylic; central area spanned by numerous transverse bars


Daughter taxa: (blue => in age window 0-300Ma)
Minute to small, long and narrow rhombic muroliths with a central area spanned by numerous transverse bars.
A medium-sized species of Calciosolenia possessing a distally-orientated spur-like extension to the rim, located at one end of the coccolith.
Specimens not identified to species level

Taxonomy:

Citation: Calciosolenia Gran, 1912
Rank: Genus
Type species: Calciosolenia murrayi Gran, 1912.
Synonyms: Dityolithus Górka 1957
Notes & discussion: Deflandre in Deflandre & Fert, 1954 proposed the generic name Scapholithus for fossil ‘scapholith’ coccoliths but these are indistinguishable from the extant representatives classified within Calciosolenia Gran, 1912.

Farinacci & Howe catalog pages: Calciosolenia *

Distinguishing features: Rhombic; rim bicylic; central area spanned by numerous transverse bars


Morphology remarks: Typically small, fragile and dissolution susceptible, and so only consistently seen when preservation is good.

Evolution & Phylogeny: Calciosolenia is formally in the Order Syracosphaerales and is included here with the Stephanolithiaceae to avoid having a monogeneric ordinal group - and because it shows obvious affinities with the Stephanolithiacaea.

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within Hauterivian Stage (130.77-133.88Ma, base in Hauterivian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P.R.; Rutledge, D.C.; Crux, J.A. & Gallagher, L.T., (1998). Early Cretaceous. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 86-131.

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

Gran, H.H., (1912). Pelagic plant life. In: Murray, J. and Hjort, J. (Editors), The Depths of the Ocean. Macmillan, London, pp. 307-386.

Górka, H., (1957). Les Coccolithophoridés du Maestrichtien supérieur de Pologne. Acta Palaeontologica Polonica, 2: 239-284.


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Calciosolenia compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-11-2018

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