Daughter taxa (time control age-window is: 0-800Ma) | Granddaughter taxa | ||||
Umbellosphaera Coccoliths trumpet-shaped |
Taxonomy:
Distinguishing features:
Parent taxon (Coccolith families inc sed): 2N: Various heterococcolith groups not obviously related to the well-defined orders
N: mostly unknown
This taxon: Placolith-like with distal shield much larger than proximal, predominantly formed from R-units, V-units vestigial.
Original description: Diagnosis: Coccosphaera dimorpha; coccolithi consistunt ex parte distali infundibiliformi in fundo plano. Infundibli elementa continua sunt cum elementis plani basalis area centralis; interdum annulus circumdat aream basalem, consistens ex separato elementorum cyclo. Coccolithi variabiles quoad mensuram.
Translation: Coccosphere dimorphic; coccoliths consist of a funnel-shaped distal part on a flat base. The funnel elements are continuous with the basal plate elements of the central area; a flange may be present around the basal plate, formed by a separate cycle of elements. Coccoliths are variable in size.
Farinacci & Howe catalog pages: Umbellosphaeraceae *
Morphology:
Lith size: 1.5->10µm; |
Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within NN15 zone (3.70-3.92Ma, base in Zanclean stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Kleijne, A. (1993b). Morphology, Taxonomy and distribution of extant coccolithophorids (Calcareous nannoplankton). PhD Thesis, Vrije Universiteit Amsterdam. 1-321. gs Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research. S1: 1-132. gs References:
Umbellosphaeraceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 7-12-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1459 Go to Archive.is to create a permanent copy of this page - citation notes |
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