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 0-800Ma)
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): at base of Hauterivian Stage (0% up, 133.9Ma, 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. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. 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

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

Gran, H. H. (1912). Pelagic plant life. In, Murray, J. & Hjort, J. (eds) The Depths of the Ocean. Macmillan, London 307-386. gs


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Calciosolenia compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-8-2019

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