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Rhagodiscus robustus
Mesozoic taxa
Rhagodiscus robustus
Edited by Paul Bown on Sun, 18/03/2012 - 13:10
Citation:
Rhagodiscus robustus Bown, 2005
Diagnosis:
Large (>8.0 µm) loxolith coccoliths with a broad rim (usually as broad or broader than the central area) and a central area spanned by a granular plate; a relatively large spine or spine base is usually present. The broad and blocky rim shows yellow interference colors under XPL.
Holotype:
Remarks:
Distinguished from other rhagodiscids by its large size and relatively closed central area, with some specimens resembling the Jurassic coccolith species Crepidolithus crassus. The Albian ‘Crepidolithus’ burwellensis Black, 1972 (holotype scanning electron micrograph [SEM] only) displays a Crepidolithus-like rim but is small (~4.0 µm) and has an open central area crossed by a transverse bar.
Size:
Holotype length = 8.7µm
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Mesozoic: Rhagodiscus robustus
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