Cribrosphaerella


Classification: Mesozoic -> Podorhabdales -> Axopodorhabdaceae -> Cribrosphaerella
Sister taxa: Axopodorhabdus, Cribrocorona, Cribrosphaerella, Dodekapodorhabdus, Ethmorhabdus, Hemipodorhabdus, Hexapodorhabdus, Nephrolithus, Octocyclus, Octopodorhabdus, Perissocyclus, Podorhabdus, Psyktosphaera, Teichorhabdus, Tetrapodorhabdus,

Distinguishing features: Elliptical to subrectangular; central-area with coarsely-perforate net.


Daughter taxa: (blue => in age window 0-300Ma)
Small (4-6µm), sub-circular, Cribrosphaerella species
Large, broadly elliptical, Cribrosphaerella species with narrow rim
Typical Cribrosphaerella species
Cribrosphaerella with small central area
Large oblong species of Cribrosphaerella with broad shield
Specimens not identified to species level

Taxonomy:

Citation: Cribrosphaerella Deflandre in Piveteau, 1952
Rank: Genus
Type species: Cribrosphaerella ehrenbergii (Arkhangelsky, 1912) Deflandre in Piveteau, 1952
Synonyms:
Notes & discussion: Although several species have been described most authors assign all specimens to C. ehrenbergii

Farinacci & Howe catalog pages: Cretadiscus * Cribrosphaera * Cribrosphaerella + * Favocentrum *

Distinguishing features: Elliptical to subrectangular; central-area with coarsely-perforate net.


Morphology remarks: Well-preserved specimens show three-shields (or tiers), the upper two shields are formed of V-units, and on overgrown species may fuse into one mass. The proximal shield is formed of R-units with the V-units appearing as a cycle of peg-like elements between the R-units.

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 Albian Stage (100.50-112.95Ma, base in Albian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Arkhangelsky, A.D., (1912). Upper Cretaceous deposits of east European Russia. Materialien zur Geologie Russlands, 25: 1-631.

Burnett, J.A., (1998). Upper Cretaceous. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 132-199.

Gartner, S., (1968). Coccoliths and related calcareous nannofossils from Upper Cretaceous deposits of Texas and Arkansas. The University of Kansas Paleontological Contributions, Article 48 (Protista 1): 1-56.

Piveteau, J., (1952). Traité de Paléontologie. In: Grassé, P.P. (Editor), Traité de zoologie. Anatomie, systématique, biologie, 1, part 1, Phylogenie. Protozoaires: généralités. Flagellés. Masson and Cie, Paris, pp. 107-115,.


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Cribrosphaerella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-7-2018

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