Cretarhabdus


Classification: Mesozoic -> Podorhabdales -> Cretarhabdaceae -> Cretarhabdus
Sister taxa: Speetonia, Cruciellipsis, Flabellites, Grantarhabdus, Helenea, Cretarhabdus, Retecapsa, Pickelhaube, Miravetesina,

Distinguishing features: Cretarhabdids with central area net that often includes axial cross bars.


Daughter taxa: (blue => in age window 0-800Ma)
Medium to very large (7-15 µm) Cretarhabdid coccoliths with a distinct central area axial cross and net.
Small (3-6 µm) Cretarhabdus with an irregular central grill. The bars of the grill are distinctly birefringent in XPL.
Medium to large (7-12 µm) with relatively wide central area and multiple lateral bars (~4 in each quadrant).
Large to very large (9-15 µm) Cretarhabdus with distinctive wide central net that includes narrow axial cross bars and multiple narrow lateral bars. The bars of the net are birefringent.
Specimens not identified to species level

Taxonomy:

Citation: Cretarhabdus Bramlette & Martini, 1964
Rank: Genus
Type species: Cretarhabdus conicus Bramlette and Martini, 1964.
Synonyms:
Notes & discussion: Cretarhabdus is separated from Retecapsa on the grounds of having a fine net rather than relatively few cross-bars. This is subjective and arguably not very satisfactory, but it is widely used.

Farinacci & Howe catalog pages: Cretarhabdus + + * , Allemanites * , Cretarhabdella * , Polypodorhabdus * , Stradneria *

Distinguishing features: Cretarhabdids with central area net that often includes axial cross bars.

Search data:
TagsLITHS: placolith, elliptical, CA: cross-axial, grill, process, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-unicyclic,
MetricsLith size: 3->15µm;
Sources: 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 Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Oxfordian Stage (0% up, 163.5Ma, in Oxfordian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Black, M. (1971). Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society. 38: 381-424. gs :: ::

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs :: ::

Bramlette, M. N. & Martini, E. (1964). The great change in calcareous nannoplankton fossils between the Maestrichtian and Danian. Micropaleontology. 10(2): 291-322. gs :: ::

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

Grün, W. & Allemann, F. (1975). The Lower Cretaceous of Caravaca (Spain): Berriasian Calcareous Nannoplankton of the Miravetes Section (Subbetic Zone, Prov. of Murcia). Eclogae Geologicae Helvetiae. 68: 147-211. gs :: view :: open

Lambert, B. (1987). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional. Cahiers de Micropaléontologie. 2(2): 33-60. gs :: ::

Young, J. R. & Bown, P. R. (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research. 33(1): 39-46. gs :: view :: open


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Cretarhabdus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 4-7-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10299 Go to Archive.is to create a permanent copy of this page - citation notes



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