Umbellosphaeraceae


Ancestry: Coccolithophores -> Coccolith families inc sed -> Umbellosphaeraceae
Sister taxa: unidentified, Alisphaeraceae, Papposphaeraceae, Umbellosphaeraceae, narrow rimmed placoliths, Coccolith genera inc sed,

Short diagnosis: Placolith-like with distal shield much larger than proximal, predominantly formed from R-units, V-units vestigial.


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Coccoliths trumpet-shaped

Taxonomy:

Citation: Umbellosphaeraceae Young et al., 2003
Rank: Family
Type species: Umbellosphaera tenuis
Notes & discussion: Kleijne (1993) described a sub-family, the Umbellosphaeroideae, within the Syracosphaeraceae, including Umbellosphaera and Gaarderia. With higher resolution SEM observations and better understanding of Syracosphaera coccolith morphology it became clear that Gaarderia corolla should be recombined into Syracosphaera, but that Umbellosphaera is not associated with the Syracosphaerales. For consistency of taxonomic usage, Young et al. (2003) raised the taxon Umbellosphaeroideae from sub-family to family status.

Farinacci & Howe catalog pages:

Short diagnosis: Placolith-like with distal shield much larger than proximal, predominantly formed from R-units, V-units vestigial.


Morphology remarks: Coccosphere dimorphic; coccoliths consist of a funnel-shaped distal part on a flat base. The funnel elements are continuous with the basal plate elements of the central area; a flange may be present around the basal plate, formed by a separate cycle of elements. Coccoliths are variable in size.

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within Zanclean Stage (3.60-5.33Ma, base in Zanclean stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Kleijne, A., (1993). Morphology, Taxonomy and distribution of extant coccolithophorids (Calcareous nannoplankton). Drukkerij FEBO B.V., Katwijk, 321 pp.

Young, J.R.; Geisen, M.; Cros, L.; Kleijne, A.; Probert, I. & Ostergaard, J.B., (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research, Special Issue, 1: 1-132.


Nannotax3 - Coccolithophores - Umbellosphaeraceae by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-6-2017

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AphiaID: 573998 Nomenclatural data on WoRMS

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