Sphenolithaceae


Ancestry: Coccolithophores -> Discoasterales -> Sphenolithaceae
Sister taxa: Discoasteraceae, Fasciculithaceae, Heliolithaceae, Sphenolithaceae,

Short diagnosis: Conical discoasteralids with a concave base, consisting of a mass of elements radiating from a common origin.


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Conical nannoliths with a concave base, consisting of a mass of elements radiating from a common origin.

Taxonomy:

Citation: Sphenolithaceae Deflandre 1952
Rank: Family

Farinacci & Howe catalog pages: Sphenolithaceae [no catalog entry yet]

Short diagnosis: Conical discoasteralids with a concave base, consisting of a mass of elements radiating from a common origin.


Morphology remarks: See genus Sphenolithus for discussion.

Evolution & Phylogeny: Sphenoliths first appear in the Palaeocene and go extinct in the mid Pliocene. They show some similarities to Fasciculithaceae and are thought to have similar origins.

Search data:
TagsLITHS: nannolith-radiate, N: 3D-radiate, conical, circular, RIM: tiered,
CSPH: not known,
MetricsLith size: 2->20µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Piacenzian Stage (2.59-3.60Ma, top in Piacenzian stage). Data source: Total of range of species in this database
First occurrence (base): within Danian Stage (61.61-66.04Ma, base in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Deflandre, G., (1952). Classe des Coccolithophoridés. (Coccolithophoridae. Lohmann, 1902). In: Grassé, P.P. (Editor), Traite de Zoologie. Masson, Paris, pp. 439-470.

Perch-Nielsen, K., (1985). Cenozoic calcareous nannofossils. In: Bolli, H.M., Saunders, J.B. and Perch-Nielsen, K. (Editors), Plankton Stratigraphy. Cambridge University Press, Cambridge, pp. 427-555.


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Sphenolithaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-9-2017

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