flat-topped

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	Holococcolithophora cialdii Holococcolithophora dentata
				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 Syrcosphaera 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.	Syracosphaera bannockii HOL Zygosphaera amoena Zygosphaera marsilii Zygosphaera sp.

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]

Geological Range:
Last occurrence (top): Extant. Data source: Total of range of species in this database
First occurrence (base): at base of Gelasian Stage (0% up, 2.6Ma, in Piacenzian stage). Data source: Total of range 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: Holococcoliths

flat-topped compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-5-2023 Taxon Search: Advanced Search AphiaID: not found Short stables 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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