Parhabdolithaceae
Classification: ntax_mesozoic -> Stephanolithiales -> Parhabdolithaceae
Sister taxa: Parhabdolithaceae, Stephanolithiaceae
Distinguishing features: 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.
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 |  |  |  | Calcivascularis
Protolith coccoliths with high rim, inner rim cycle not clearly developed, upper part of coccolith filled by mass of radiating elements.
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 |  |  |  | Crucirhabdus
Protolith coccoliths with low, sloping rim; central area wide with axial cross supporting a tall spine
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 |  |  |  | Diductius
Protolith coccoliths with low, sloping rim; central area wide with a multiperforate net that may incorporate spine-bearing axial cross bars.
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 |  |  |  | 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
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 |  |  |  | Parhabdolithus
Protolith coccoliths with high rim; central area with large spine supported by transverse bar. Often seen in side view
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 |  |  |  | Timorella
Modified protoliths, with tapering, cup-like rim and central-area plate.
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 |  |  |  | Umbria
Protolith coccoliths with low, sloping rim; central area wide filled by blocky laths
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Taxonomy:
Citation: Parhabdolithaceae Bown, 1987Rank: Family
Farinacci & Howe catalog pages: Parhabdolithaceae [no catalog entry yet]
Distinguishing features: 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:
| Tags | LITHS: murolith, elliptical, CA: ca_disjunct, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
| Metrics | Lith 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:
- 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. For the customisable plot option go to a genus page Parent: Stephanolithiales
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
