Cretarhabdus
Classification: ntax_mesozoic -> Podorhabdales -> Cretarhabdaceae -> Cretarhabdus
Sister taxa: Mattiolia, Wisea ⟩⟨ Speetonia ⟩⟨ Cruciellipsis, Flabellites, Grantarhabdus, Helenea ⟩⟨ Cretarhabdus, Retecapsa, Pickelhaube, Miravetesina
Distinguishing features: Cretarhabdids with central area net that often includes axial cross bars.
Daughter taxa (time control age-window is: 0-800Ma) |
 |  |  |  | Cretarhabdus conicus
Medium to very large (7-15 µm) cretarhabdid coccoliths with a distinct central area axial cross and net.
|
 |  |  |  | Cretarhabdus inaequalis
Small (3-6 µm) Cretarhabdus with an irregular central grill. The bars of the grill are distinctly birefringent in XPL.
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 |  |  |  | Cretarhabdus madingleyensis
Medium to large (7-12 µm) with relatively wide central area and multiple lateral bars (~4 in each quadrant).
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 |  |  |  | Cretarhabdus striatus
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.
|
 |  |  |  | Cretarhabdus sp.
Specimens not identified to species level
|
Lambert87-fig5-1.JPG
Taxonomy:
Citation: Cretarhabdus Bramlette & Martini, 1964Rank: GenusType species: Cretarhabdus conicus Bramlette and Martini, 1964.Synonyms:
- Allemanites Grün in Grün & Allemann 1975
- Stradneria Reinhardt (1964) (type species C. limbicrassa is a junior synonym of Cretarhabdus conicus)
- Cretarhabdella Black 1971 (type species C. lateralis is a junior synonym of Cretarhabdus conicus)
- Polypodorhabdus Noël, 1965 - cf. Young & Bown 2014
Taxonomic 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:
| Tags | LITHS: placolith, elliptical, CA: cross-axial, ca_disjunct, grill, process, CROSS-POLARS: rim-unicyclic, R-prominent, |
| Metrics | Lith size: 3->15µm;
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 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:
- 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: Cretarhabdaceae
References:
Black, M. (1971a). 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 V O
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 V O
Lambert, B. (1987). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional. Cahiers de Micropaléontologie. 2(2): 33-60. gs V O
Young, J. R. & Bown, P. R. (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research. 33(1): 39-46. gs V O
