Kamptneriaceae


Ancestry: Mesozoic -> Arkhangelskiales -> Kamptneriaceae
Sister taxa: Arkhangelskiellaceae, Kamptneriaceae,

Short diagnosis: Arkhangelskielids with shields predominantly formed of V-units, thus dark in cross-polarised light; R-units form bright band at core of shield.


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Tiered coccoliths with perforate central-area plate and axial cross and/or sutures.

Tiered coccoliths with distinctive LM images consisting of a narrow to moderately-broad rim with a narrow, dark outer-cycle; a diagnostic, bright median-cycle; and a dark, inner-cycle. Central-area structures variable but generally dark in LM.

Tiered placoliths with broad rim that has an asymmetric flange forming a wing and narrow central area spanned by a perforate plate. Typical kamptneriacean LM image with a narrow, dark outer-cycle; a diagnostic, bright median-cycle; a dark, inner-cycle; and a dark central area plate.

Simlar to Gartnerago but rim with only 3 tiers and outline elongate-hexagonal rather than elliptical

Taxonomy:

Citation: Kamptneriaceae Bown & Hampton, 1997 in Bown & Young, 1997
Rank: Family
Type species: Type: Kamptnerius Deflandre, 1959.

Farinacci & Howe catalog pages:

Short diagnosis: Arkhangelskielids with shields predominantly formed of V-units, thus dark in cross-polarised light; R-units form bright band at core of shield.


Morphology remarks: Tiered placoliths and modified loxolith coccoliths, with distinctive LM images consisting of a narrow to moderately-broad rim with a narrow, dark outer-cycle; a diagnostic, bright median-cycle; and a dark, inner-cycle. Central-area structures are generally dark in LM, and may be a transverse bar, axial or diagonal cross bars or plate, usually perforate; proximally-situated fine nets may be seen when preservation is good. Rim structure varies from apparently typical loxolith (e.g. Thierstein, 1974: pl.4, figs 1, 9, 12) to placolith-like, with at least three (pseudo) 'shields' (e.g. Thierstein, 1974: pl.7, figs 6, 8). The tiered nature is produced by lateral protrusions from the outer cycle of the loxolith wall.
The V-unit cycle dominates the rim, resulting in a largely dark image in xpl. It is formed of an inner and outer cycle,the outer cycle forms the tiers visible in side view, and the flange of Kamptnerius. The inner cycle extends inward to meet the central area elements. A thin cycle of R-units, occurs between the two V-unit cycles and is seen as a peg-like cycle in proximal view (described as a "beaded crown" by Perch-Nielsen 1985) but does not extend to the distal surface, separate inrr and outer rim it is this cycle which creates the distinctive bright median-cycle in xpl.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Aptian Stage (112.95-126.30Ma, base in Aptian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P.R. & Young, J.R., (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research, 19(1): 21-36.

Bown, P.R.; Rutledge, D.C.; Crux, J.A. & Gallagher, L.T., (1998). Early Cretaceous. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 86-131.

Deflandre, G., (1959). Sur les nannofossiles calcaires et leur systématique. Revue de Micropaleontologie, 2: 127-152.

Thierstein, H.R., (1974). Calcareous nannoplankton - Leg 26, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project, 26: 619-667.


Nannotax3 - Mesozoic - Kamptneriaceae by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-4-2017

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