Daughter taxa (time control age-window is: 0-800Ma) | Granddaughter taxa | ||||
Ellipsolithus Elongate, rounded-oblong placoliths with unicyclic distal shields built of numerous (>50) narrow elements< | |||||
Haqius Unicyclic, elliptical and circular placolith coccoliths with a narrow or closed central area and a characteristically dark gray (low birefringence) XPL image. | |||||
Markalius Circular placoliths with moderately birefringent shields, a bright inner tube cycle and narrow or closed central areas. | |||||
Prolatipatella Narrow rim with thin, imperforate plate across wide central-area. | |||||
Repagulum Placoliths with monocyclic distal shield with numerous, narrow elements and central-area spanned by ~20 radial bars. In LM the coccoliths are distinctive but inconspicuous with low birefringence, "flaring" image. |
Taxonomy:
Farinacci & Howe catalog pages:
Search data:
Lith size: 0->0µm; Data source notes: size range of included species |
Geological Range:
Last occurrence (top): at top of NP21 zone (100% up, 32.9Ma, in Rupelian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Late Tithonian Substage (143.10-145.00Ma, base in Tithonian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
placoliths inc sedis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-9-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10907 Go to Archive.is to create a permanent copy of this page - citation notes |
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