Nannotax3 - ntax_cenozoic

Nannotax3 - ntax_cenozoic - convex Nannotax3 - ntax_cenozoic - convex

convex

Classification: ntax_cenozoic -> Holococcoliths -> convex
Sister taxa: tubeless, convex, bridged, flat-topped, septate, open-tube, fossil holococcoliths, U. extant holococcolith

Daughter taxa (time control age-window is: 0-800Ma)		Granddaughter taxa
	not elevated - height < length
	Calyptrosphaera sphaeroidea HOL Tube merges into cover; irregular crystallites
	Syracosphaera pulchra HOL oblonga type Tube merges into cover; hexagonal mesh fabric
	Syracosphaera pulchra HOL pirus type Tube and cover sharply separated; cover with openings at base
	Syracosphaera pulchra HOL galea type Tube high and well-separated from cover; hexagonal mesh fabric
	Calyptrolithina divergens Tube sharply separated from cover; cover with perforations
	elevated - height > length
	Calyptrosphaera heimdaliae Tube and cover sharply separated; cover elevated with large openings at base and an apical perforation
	Calyptrosphaera lluisae Low wall with domal cover, ring of small perforations at base of cover and an apical perforation
	Calyptrosphaera radiata Liths tubular with large openings near base and closed distal end. Coccosphere vari-monomorphic (coccolith height varies)
	Flosculosphaera Flaring tube-shaped coccoliths with distal cover - flosculoliths. Monomorphic.	Flosculosphaera calceolariopsis Flosculosphaera sacculus
	Gliscolithus Bulb-shaped coccoliths - gliscoliths. Monomorphic.	Gliscolithus amitakareniae

Taxonomy:

Citation: Holococcoliths with convex cover over the tube - informal grouping proposed by Young et al., 2003

Rank: informal group of genera

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 convex cover

Farinacci & Howe catalog pages: convex [no catalog entry yet]

Search data:

Lith size: 0.9->3.2µm;

The morphological data given here can be used on the advanced search page. See also these notes

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

References:

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 V O

convex compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-4-2023

Taxon Search:

Advanced Search

AphiaID: not found
Short stables page link: https://mikrotax.org/Nannotax3/index.php?id=344 Go to Archive.is to create a permanent copy of this page - citation notes

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