Pontosphaeraceae


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

Daughter taxa: (blue => in age window 0-800Ma) 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

Distinguishing features: Monomorphic or dimorphic; liths muroliths with perforate central area

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


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): at base of Selandian Stage (4% up, 61.5Ma, 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. (2009a). First observations of heterococcolithophore-holococcolithophore life cycle combinations in the family Pontosphaeraceae (Calcihaptophycideae, Haptophyta). Marine Micropaleontology. 71(1): 20-27. gs

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


nannotaxlogo400px

Pontosphaeraceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-12-2019

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1105 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics