Nannotax3 - ntax_mesozoic - Cribrosphaerella

Nannotax3 - ntax_mesozoic - Cribrosphaerella Nannotax3 - ntax_mesozoic - Cribrosphaerella

Cribrosphaerella

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

Distinguishing features:
Parent taxon (Axopodorhabdaceae): Regular placoliths; central-area, with cross-bars or perforated plate; often with tall, hollow spines.
Distal shield elements non-imbricate V-units; proximal shield and inner cycle formed from R-units. Rim often appears beaded in LM
This taxon: Elliptical to subrectangular; central-area with coarsely-perforate net.

Daughter taxa (time control age-window is: 0-800Ma)
				Cribrosphaerella circula Small (4-6µm), sub-circular, Cribrosphaerella species
				Cribrosphaerella daniae Large Cribrosphaerella species with narrow rim
				Cribrosphaerella ehrenbergii Typical Cribrosphaerella species
				Cribrosphaerella pelta Cribrosphaerella with small central area
				Cribrosphaerella santacruzensis Large oblong species of Cribrosphaerella with broad shield
				Cribrosphaerella sp. Specimens not identified to species level

JRYSEM-175-18.JPG
Bown&Young1997 f3 19.jpg

Taxonomy:

Citation: Cribrosphaerella Deflandre in Piveteau, 1952

taxonomic rank: Genus

Type species: Cribrosphaerella ehrenbergii (Arkhangelsky, 1912) Deflandre in Piveteau, 1952

Synonyms:

Cretadiscus Gartner 1968;
Cribrosphaera Arkhangelsky, 1912
Favocentrum Black 1964

Taxonomic discussion: Although several species have been described most authors assign all specimens to C. ehrenbergii

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

Morphology:

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.

Search data:

LITHS: placolith, elliptical, CA: ca_disjunct, grill, plate, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,

Lith size: 4->12µm;
Data source notes: size range of included species

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Albian Stage (100.50-113.20Ma, base in Albian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Axopodorhabdaceae

References:

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

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

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O

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

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