Nannotax3 - ntax_mesozoic - Parhabdolithus

Parhabdolithus


Classification: ntax_mesozoic -> Stephanolithiales -> Parhabdolithaceae -> Parhabdolithus
Sister taxa: Bucanthus, Calcivascularis, Crucirhabdus, Diductius, Mitrolithus, Parhabdolithus, Timorella, Umbria

Distinguishing features:
Parent taxon (Parhabdolithaceae): Murolith (protolith type) coccoliths with bicylic rims and central-areas spanned by an axial-cross or transverse bar bearing a broad, often long, spine.
This taxon: Protolith coccoliths with high rim; central area with large spine supported by transverse bar. Often seen in side view


Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Parhabdolithus liasicus
Parhabdolithus with tall, tapering spine.
P. liasicus subsp. distinctus
P. liasicus subsp. liasicus

Parhabdolithus marthae
Parhabdolithus with very broad, tapering spine.

Parhabdolithus robustus
Parhabdolithus with broad, parallel-sided, bluntly terminated spine. Spine usually terminates just above the rim, and does not exceed twice the rim height.

Parhabdolithus stubbingsii
Elliptical murolith (protolith) with a high, flaring rim composed of non-imbricating elements; the central area is filled by the broad, granular base of a prominent distal process/spine and a proximal grid composed of bars aligned parallel with the short axis of the coccolith.

Parhabdolithus sp.
Specimens not identified to species level

Taxonomy:

Citation: Parhabdolithus Deflandre in Grassé 1952
Rank: Genus
Type species: Parhabdolithus liasicus Deflandre in Grassé, 1952

Farinacci & Howe catalog pages: Parhabdolithus + *

Distinguishing features:
Parent taxon (Parhabdolithaceae): Murolith (protolith type) coccoliths with bicylic rims and central-areas spanned by an axial-cross or transverse bar bearing a broad, often long, spine.
This taxon: Protolith coccoliths with high rim; central area with large spine supported by transverse bar. Often seen in side view


Morphology: Protolith coccoliths with high rim; central area with large spine supported by transverse bar. Bicyclic rim image in XPL, but often seen in side view

Search data:
TagsLITHS: murolith, elliptical, CA: ca_disjunct, grill, process, bar, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 2.5->7µm;
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): in lower part of Barremian Stage (30% up, 129.4Ma, in Barremian stage). Data source: Total of range of species in this database
First occurrence (base): near top of Hettangian Stage (90% up, 199.5Ma, in Hettangian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

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

Deflandre, G. (1952). Classe des Coccolithophoridés. (Coccolithophoridae. Lohmann, 1902). In, Grassé, P. P. (ed.) Traité de Zoologie. Masson, Paris 439-470. gs


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Parhabdolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 9-12-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10856 Go to Archive.is to create a permanent copy of this page - citation notes



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