Parhabdolithaceae

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.	Bucanthus decussatus Bucanthus lusitanicus Bucanthus sp.
				Calcivascularis Protolith coccoliths with high rim, inner rim cycle not clearly developed, upper part of coccolith filled by mass of radiating elements.	Calcivascularis cassidyi Calcivascularis jansae Calcivascularis sp.
				Crucirhabdus Protolith coccoliths with low, sloping rim; central area wide with axial cross supporting a tall spine	Crucirhabdus minutus Crucirhabdus primulus Crucirhabdus sp.
				Diductius Protolith coccoliths with low, sloping rim; central area wide with a multiperforate net that may incorporate spine-bearing axial cross bars.	Diductius constans Diductius 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	Mitrolithus elegans Mitrolithus lenticularis Mitrolithus sp.
				Parhabdolithus Protolith coccoliths with high rim; central area with large spine supported by transverse bar. Often seen in side view	Parhabdolithus liasicus Parhabdolithus marthae Parhabdolithus robustus Parhabdolithus stubbingsii Parhabdolithus sp.
				Timorella Modified protoliths, with tapering, cup-like rim and central-area plate.	Timorella cypella Timorella sp.
				Umbria Protolith coccoliths with low, sloping rim; central area wide filled by blocky laths	Umbria granulosa Umbria sp.

Taxonomy:

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.

Original description: Diagnosis. 'Coccoliths with a protolith rim structure, i.e. a rim typically consisting of a dominant and characteristic distal shield composed of laths arranged vertically and subvertically and tangentially to an ellipse with sutures perpendicular to the coccolith base; and a proximal shield composed of elements with a triangular cross-section which form a flat coccolith base with radiating sutures and also extend upwards ot form an inner cycle ot the distal shield' (Bown 1987).
LM characteristics. As for the Zygodiscacee; the imbrication or non-imbrication of the distal shield elements cannot be distinguished.

Farinacci & Howe catalog pages: Parhabdolithaceae *

Morphology:

Geological Range:
Last occurrence (top): at top of Early Barremian Substage (100% up, 124.4Ma, in Barremian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NT2b subzone (194.83-218.41Ma, base in Norian stage). Data source: Total of ranges 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

Parhabdolithaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-8-2025 Taxon Search: Advanced Search 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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