Nannotax3 - ntax_mesozoic - Petrarhabdus

Petrarhabdus


Classification: ntax_mesozoic -> Podorhabdales -> Prediscosphaeraceae -> Petrarhabdus
Sister taxa: Petrarhabdus, Prediscosphaera

Distinguishing features:
Parent taxon (Prediscosphaeraceae): Regular placoliths; central area spanned by cross-bars supporting a tall, complexely-constructed spine.
The distal shield and proximal shield constructed from 16 large non-imbricating elements (V-units); R-units form restricted cycle on proximal shield and inner tube cycle, giving bicyclic LM image with bright inner cycle.

This taxon: Prediscosphaera with massive, blocky spine covering most of the distal surface.


Daughter taxa (time control age-window is: 0-800Ma)
Petrarhabdus copulatus
Prediscosphaera with massive, four-part, blocky, square spine covering most of the distal surface.
Petrarhabdus kirenii

Petrarhabdus vietus
>A species of Petrarhabdus in which the spine is significantly smaller than the coccolith. In the LM, the image is very highly birefringent.  In the SEM, the spine appears to be composed of three stacks of calcite blocks.
Petrarhabdus sp.
Specimens not identified to species level

Taxonomy:

Citation: Petrarhabdus Wind & Wise in Wise, 1983
Rank: Genus
Type species: Petrarhabdus copulatus (Deflandre, 1959) Wind & Wise in Wise, 1983

Farinacci & Howe catalog pages: Petrarhabdus *

Distinguishing features:
Parent taxon (Prediscosphaeraceae): Regular placoliths; central area spanned by cross-bars supporting a tall, complexely-constructed spine.
The distal shield and proximal shield constructed from 16 large non-imbricating elements (V-units); R-units form restricted cycle on proximal shield and inner tube cycle, giving bicyclic LM image with bright inner cycle.

This taxon: Prediscosphaera with massive, blocky spine covering most of the distal surface.

Search data:
TagsLITHS: placolith, circular, elliptical, quadrate, CA: cross-axial, ca_disjunct, process, CROSS-POLARS: V-prominent,
MetricsLith size: 7->20µm;
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 range of species in this database
First occurrence (base): at base of Cenomanian Stage (0% up, 100.5Ma, in Albian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

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

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

Wise, S. W. (1983). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 71 in the Falkland Plateau region, Southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 481-550. gs V O


nannotaxlogo400px

Petrarhabdus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 7-12-2021

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10889 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics