Nannotax3 - ntax_cenozoic - fossil holococcoliths

fossil holococcoliths

Classification: ntax_cenozoic -> Holococcoliths -> fossil holococcoliths
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
	Holococcoliths formed from multiple blocks
	Daktylethra Domed cavate holococcoliths with surficial shallow pits.	D. punctulata D. probertii D. unitatis D. basilica D. sp.
	Holodiscolithus Elliptical holococcoliths with perforations.	H. agniniae H. catellus H. geisenii H. lippertii H. liui H. macroporus H. minolettii H. serus H. solidus H. whitesideae H. sp.
	Lanternithus Cavate holoccoliths with distinct crystallographic blocks.	L. arcanus L. duocavus L. jawzii L. minutus L. procerus L. simplex L. unicavus M. emrei L. sp.
	Multipartis Holococcoliths with multiple elements in the central area	M. ponticus
	Octolithus Holoccoliths with distinct rim and cover blocks, typically eight.	O. multiplus O. sp.
	Quadrilateris Rectangular holococcoliths formed from four thin blocks that are birefringent in XPL.	Q. imparidividuus Q. sp.
	Semihololithus Paleogene holococcoliths usually seen in side view and comprising a thick proximal plate and spine or process, typically with a cavity or axial canal.	S. biskayae S. dimidius S. kanungoi S. pseudobiskayae S. sp. cf. S. biskayae S. tentorium N. figularia N. hexaporus S. sp.
	Varolia Cavate, thin walled, box-like holococcoliths usually seen in side view.	V. boomeri V. cistula V. gracilimura V. macleodii V. sicca V. sp.
	Youngilithus Geometrically shaped non-birefringent holococcoliths typically possessing lateral rim spines and central area bars.	Y. arcaeformis Y. bipons Y. oblongatus Y. pyxis Y. quadraeformis Y. transversipons Y. sp.
	Zygrhablithus Spinose holococcoliths, which are birefringent in side view. In plan view the coccoliths are non-birefringent with a distinct figure-of-eight shaped central structure.	Z. bijugatus Z. sileensis Z. sp.
	Holococcoliths formed from a single block
	Aubrysphaera	A. deconinckii
	Clathrolithus Unusual holococcoliths with non-coccolith morphology typically comprising an elliptical, concavo-convex, domed, perforate framework.	C. arenarius C. ellipticus C. joidesa C. minutus C. sp.
	Corannulus Discoidal holococcoliths with large central openings and marginal perforations or indentations; non-birefringent in plan view.	C. germanicus C. horridulus C. sp.
	Orthozygus Single-block holococcoliths that typically have a spine or process and transverse bridge or bars.	O. arcus O. aureus O. brytika O. occultus O. sudis O. suggrandis O. sp.
	Unidentified fossil holococcoliths

Taxonomy:

Citation: fossil holococcoliths

Rank: informal group of genera

Synonyms: Calyptrosphaeraceae Boudreaux & Hay, in Hay et al 1967

Taxonomic discussion: As indicated there is a significant group of fossil holococcoliths which behave as a single crystal unit, or block, in cross-polars, and typically show very low birefingence in plan view. This spearation is not perfectly refelcted in the taxonomy though as some species which show this crystallography occur in Youngilithus and Holococcolithus.

Distinguishing features:
Parent taxon (Holococcoliths): Haploid life-cycle stages, with liths formed of numerous rhombohedral microcrystals
This taxon: Holococcolith genera only known from the fossil record

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

Morphology:

Whilst this is a very disparate group of genera they are mostly larger than extant holococcoliths and tend to have distinctive shapes, rather than being simple discs.

Size:

Search data:

Tags	LITHS:
Metrics	Lith size: 0->0µm;

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

Geological Range:
Last occurrence (top): in upper part of Ionian Stage (75% up, 0.3Ma, in Ionian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Campanian Stage (0% up, 83.6Ma, in Campanian 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:

Hay, W. W., Mohler, H. P., Roth, P. H., Schmidt, R. R. & Boudreaux, J. E. (1967). Calcareous nannoplankton zonation of the Cenozoic of the Gulf Coast and Caribbean-Antillean area, and transoceanic correlation. Transactions of the Gulf-Coast Association of Geological Societies. 17: 428-480. gs O

fossil holococcoliths compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 7-7-2022

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=595 Go to Archive.is to create a permanent copy of this page - citation notes

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