Nannotax3 - ntax_main - Heliolithaceae Nannotax3 - ntax_main - Heliolithaceae

Heliolithaceae


Classification: ntax_main -> Discoasterales -> Heliolithaceae
Sister taxa: Discoasteraceae, Fasciculithaceae, Heliolithaceae, Sphenolithaceae

Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
superposed cycles
Heliotrochus
Three superposed cycles - disk and column strongly birefringent, medial cycle weakly brirefringent. Column low
Heliotrochus kleinpellii
Heliotrochus steurbautii
Heliotrochus trypa

Bomolithus
Three superposed cycles - disk and column strongly birefringent, medial cycle weakly birefringent. Column high.
Bomolithus elegans
Bomolithus universus
Bomolithus cantabriae
Bomolithus dydimolofous
Bomolithus falklandensis
Bomolithus sp.

Heliolithus
Two superposed cycles - weakly birefringent column and strongly birefringent disk

Caycedoae
Two superposed cycles - strongly birefringent column and weakly birefringent disc
Caycedoae megastypus
Caycedoae grandis
Caycedoae conicus
Caycedoae kaminadesneraidon
Caycedoae micheliorum
Caycedoae pattersonii
Caycedoae atlanticus
Caycedoae yelpaze


Taxonomy:
Citation: Heliolithaceae Hay & Mohler, 1967
Taxonomic rank: family
Taxonomic discussion: Group of nannoliths closely allied to the discoasters, and probably transitional between typically VR heterococcolith morphology and the more derived, single crystal-unit form of Discoaster.

Distinguishing features:
Parent taxon (Discoasterales): Radially symmetrical nannoliths formed from one to several separate cycles of elements that radiate from a common centre or axis.
This taxon: Discoidal discoasteralids with several distinct cycles including at least one that is birefringent.

Farinacci & Howe catalog pages:
Heliolithaceae *

Search data:
Lith size: 5->18µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of NP9b subzone (100% up, 55.9Ma, in Ypresian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Paleocene Epoch (55.96-66.04Ma, base in Danian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

Hay, W. W. & Mohler, H. P. (1967). Calcareous nannoplankton from Early Tertiary rocks at Point Labau, France and Paleocene-Early Eocene correlations. Journal of Paleontology. 41(6): 1505-1541. gs


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Heliolithaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-4-2026

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=697 Go to Archive.is to create a permanent copy of this page - citation notes



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