Daughter taxa (time control age-window is: 0-800Ma)![]() | Granddaughter taxa | ||||
Helicosphaera HOL Monomorphic; liths solid - formed of layers of crystallites in rhomboid array Coccolith distal surface with central boss and varying number of depressions. | Helicosphaera HOL catilliferus type Helicosphaera HOL confusus type Helicosphaera HOL ponticuliferus type Helicosphaera pavimentum HOL | ||||
![]() | ![]() | ![]() | Holococcolithophora -flat Monomorphic - cavate Coccoliths with broad rim and recessed distal cover without boss | ||
![]() | ![]() | S. aurisinae HOL type Dimorphic - liths cavate BCs flat topped with large openings in tube and variable openings in distal surface; tiered wall fabric; low transverse ridge. CFCs helladoliths - ridge of BCs is extended into prominent leaf, no openings in tube. | Syracosphaera aurisinae HOL Syracosphaera gaarderae HOL Syracosphaera isselii HOL Syracosphaera magnaghii HOL S. aurisinae HOL type sp. | ||
S. mediterranea HOL type Dimorphic - usually cavate BCs with flat distal cover with or without openings; central boss CFCs; with irregular bridge or distal cover arched upwards | Calyptrolithina multipora Syracosphaera histrica HOL Syracosphaera mediterranea HOL gracillima type Syracosphaera mediterranea HOL hellenica type Syracosphaera mediterranea HOL marisrubri type Syracosphaera mediterranea HOL wettsteinii type | ||||
Zygosphaera Dimorphic; liths semi-solid - formed of concentric rings of crystallites. BCs flat topped with node or ridge on distal surface, rather than a true bridge. CFCs similar with transverse bridge or leaf. |
Taxonomy:
Distinguishing features:
Parent taxon (Holococcoliths): Haploid life-cycle stages, with liths formed of numerous rhombohedral microcrystals
This taxon: Holococcoliths with tube, covered distally by a flat cover
Farinacci & Howe catalog pages: flat-topped [no catalog entry yet]
Search data:
Lith size: 1.6->3.3µm; |
Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
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:
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flat-topped compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-7-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=581 Go to Archive.is to create a permanent copy of this page - citation notes |
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