Nannotax3 - ntax_mesozoic - Parhabdolithaceae

Parhabdolithaceae


Classification: ntax_mesozoic -> Stephanolithiales -> Parhabdolithaceae
Sister taxa: Parhabdolithaceae, Stephanolithiaceae

Distinguishing features:
Parent taxon (Stephanolithiales): Murolith coccoliths with a distal/outer cycle of non-imbricating elements, i.e., in side view, the sutures are vertical or near-vertical.
This taxon: Murolith (protolith type) coccoliths with bicylic rims and central-areas spanned by an axial-cross or transverse bar bearing a broad, often long, spine.


Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Bucanthus
Protolith coccoliths with low, sloping rim; central area wide with offset central-cross.
B. decussatus
B. lusitanicus
B. sp.

Calcivascularis
Protolith coccoliths with high rim, inner rim cycle not clearly developed, upper part of coccolith filled by mass of radiating elements.
C. cassidyi
C. jansae
C. sp.

Crucirhabdus
Protolith coccoliths with low, sloping rim; central area wide with axial cross supporting a tall spine
C. minutus
C. primulus
C. sp.

Diductius
Protolith coccoliths with low, sloping rim; central area wide with a multiperforate net that may incorporate spine-bearing axial cross bars.
D. constans
D. sp.

Mitrolithus
Protolith coccoliths with high rim with broad proximal/inner rim cycle; central area filled by a massive boss/spine. Often seen in side view
M. elegans
M. lenticularis
M. sp.

Parhabdolithus
Protolith coccoliths with high rim; central area with large spine supported by transverse bar. Often seen in side view
P. liasicus
P. marthae
P. robustus
P. stubbingsii
P. sp.

Timorella
Modified protoliths, with tapering, cup-like rim and central-area plate.
T. cypella
T. sp.

Umbria
Protolith coccoliths with low, sloping rim; central area wide filled by blocky laths
U. granulosa
U. sp.

Taxonomy:

Citation: Parhabdolithaceae Bown, 1987
Rank: Family

Farinacci & Howe catalog pages: Parhabdolithaceae [no catalog entry yet]

Distinguishing features:
Parent taxon (Stephanolithiales): Murolith coccoliths with a distal/outer cycle of non-imbricating elements, i.e., in side view, the sutures are vertical or near-vertical.
This taxon: Murolith (protolith type) coccoliths with bicylic rims and central-areas spanned by an axial-cross or transverse bar bearing a broad, often long, spine.


Morphology: The LM image is usually bicyclic, with the proximal/inner-cycle well-developed and the spine often fills the central area. Commonly observed in side view.

Search data:
TagsLITHS: murolith, elliptical, CA: ca_disjunct, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 0->0µm;
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): in mid part of Norian Stage (50% up, 218.9Ma, in Norian 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

Bown, P. R. (1987b). The structural development of Early Mesozoic coccoliths and its evolutionary and taxonomic significance. Abhandlungen der Geologischen Bundesanstalt. 39: 33-49. gs V O


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Parhabdolithaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-10-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10855 Go to Archive.is to create a permanent copy of this page - citation notes



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