Pontosphaeraceae


Ancestry: Coccolithophores -> Zygodiscales -> Pontosphaeraceae
Sister taxa: Helicosphaeraceae, Pontosphaeraceae, Zygodiscaceae,

Short diagnosis: Monomorphic or dimorphic; liths muroliths with perforate central area


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Coccoliths are muroliths, central area with variable number of perforations. V-units form narrow imbricate outer wall, R-units form inner wall and central-area.

Coccospheres with Pontosphaera-like body coccoliths and equatorial coccoliths with rims elevated into vase-like structures (lopadoliths).

Taxonomy:

Citation: Pontosphaeraceae Lemmermann, 1908
Rank: Family

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

Short diagnosis: Monomorphic or dimorphic; liths muroliths with perforate central area


Morphology remarks: Coccospheres sub-spherical, without flagellar opening (although flagellae have occasionally been observed). Monomorphic (Pontosphaera) or dimorphic with strongly-modified equatorial coccoliths (Scyphosphaera). Coccoliths are muroliths, central area with variable number of perforations. V-units form narrow outer rim-cycle with anti-clockwise imbrication. R-units form inner rim, with weak clockwise imbrication, baseplate and blanket.

Biology & life-cycles: Two extant species are known to have holococcolith -bearing life cycle phases, Frada et al. (2009)

Search data:
TagsLITHS: murolith, placolith, asymmetric, elliptical, RIM: outer wall acw-imbricate, wing,
CSPH: ellipsoidal, spherical, V-UNITS: distal shield, outer-rim, R-UNITS: blanket, c-str, inner-rim, px-plate,
MetricsLith size: 5->25┬Ám;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within Selandian Stage (59.24-61.61Ma, base in Selandian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Frada, M.; Percopo, I.; Young, J.R.; Zingone, A.; de Vargas, C. & Probert, I., (2009). First observations of heterococcolithophore-holococcolithophore life cycle combinations in the family Pontosphaeraceae (Calcihaptophycideae, Haptophyta). Marine Micropaleontology, 71(1): 20-27.

Lemmermann, E., (1908). Flagellatae, Chlorophyceae, Coccosphaerales und Silicoflagellatae. In: Brandt, K. and Apstein, C. (Editors), Nordisches Plankton. Botanischer Teil. Lipsius & Tischer, Kiel & Leipzig, pp. 1-40.


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

Taxon Search:
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AphiaID: 115067 Nomenclatural data on WoRMS
Go to Archive.is to create a permanent copy of this page - citation notes



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