Nannotax3 - ntax_main - Candeodiscoaster

Nannotax3 - ntax_main - Candeodiscoaster Nannotax3 - ntax_main - Candeodiscoaster

Candeodiscoaster

Classification: ntax_main -> Discoasterales -> Discoasteraceae -> Candeodiscoaster
Sister taxa: Discoaster, Catinaster ⟩⟨ Candeodiscoaster

Daughter taxa (time control age-window is: 0-800Ma)
				Davibukrya - R-units narrow
				Davidbukrya claracirculus 8-16 µm; 26-40 segments tube-cycle narrow and hollow - barely visible in side view
				Davidbukrya clemencesalleyae 14-17 µm; 26-40 segments; tube-cycle narrow and solid, thin core in side view
				Davidbukrya perchnielseniae 8-12 µm; 20-40 segments; tube-cycle narrow and solid, thin core in side view
				Candeodiscoaster - R-units narrow
				Candeodiscoaster protomultiradiatus 12-18 µm; 30-40 segments; tube-cycle narrow and solid; additional thin cycle on one side
				Carlamuelleria - R-units well-formed, hour-glass shaped
				Carlamuelleria bramlettei 7-11µm, 19-22 segments NP6-7
				Carlamuelleria karacuhae 8-11 µm 24-36 segments central area slightly elongate NP6
				Carlamuelleria katapliktikos >12 µm >40 segments broad tube-cycle
				Carlamuelleria tuezueniorum 8-12 µm 23-40 segments NP7
				Senelia - R-units wide, flush with disc
				Senelia perifanos 9-15 µm, 26-40 segments, shield pointed in side view
				Senelia plevrotos shield rounded in side view
				Noelia - R-units wide and protrude from disc
				Noelia kolona 8-11 µm 24-36 segments; no central opening; NP5-7
				Noelia mahaniae 9-12 µm 30-50 segments ; sub-circular; NP5-9
				Noelia uenverdii 8-12 µm 30-50 segments; with central opening; NP5-6

Taxonomy:

Citation: Candeodiscoaster Howe 2022

Taxonomic rank: genus

Taxonomic discussion: This group has been studied in great detail by Varol (2023) using the molbile mount technique. He proposed 4 new genera and 12 new species and showed that Bomolithus bramlettei should be transferred into it. Howe (2022) had earlier prosed the new genus Candeodiscoaster for another of the common species, D. protomultiradiatus. All new species descrtions are given in the catalog and linked to here.
All 5 of these genera have a discoaster-like disc of V-units with a core of R-uinits. The taxa are arranged in sequence of declining size of the birfringent core - and this is the likely evolutionary sequence, although a diverse range of forms appear almost simulteously in late NP5 (Varol 2023). Discoasteroides has been used in this sense in some older literature, but the type species D. keupperi is a regular Discoaster so this name is not suitable.
Of the proposed names Candeodiscoaster has priority and so is applied informally for the whole group here pending possible recombinations.

Distinguishing features:
Parent taxon (Discoasteraceae): Discoidal discoasteralids formed of one, non-birefringent in plan view, cycle.
This taxon: Ancestral discoasterids, with a birefingent central cycle (Paleocene)

Farinacci & Howe catalog pages:
Candeodiscoaster

Morphology:

Since the birefrngent core of R-units extends through the nannolith the extinction cross remains in focus as you focus up and down through the specimen.

Search data:

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): at top of NP9 zone (100% up, 55.9Ma, in Ypresian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP5 zone (59.54-61.51Ma, base in Selandian stage). Data source: Total of ranges 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
See also: customisable plot Parent: Discoasteraceae

References:

Howe, R. (2022). Candeodiscoaster, a new nannofossil genus (Coccolithophyceae, Discoasteraceae). Notulae Algarum. 244: 1-2. gs

Varol, O. (2023). New Paleocene calcareous nannofossils: Carlamuelleria, Davidbukrya, Mauriceblackia, Noelia and Senelia. Marine Micropaleontology. 180: 1-41. gs

Candeodiscoaster compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-6-2026

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1830 Go to Archive.is to create a permanent copy of this page - citation notes

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