Nannotax3 - ntax_Farinacci - Olladiscoaster asterilithos Nannotax3 - ntax_Farinacci - Olladiscoaster asterilithos

CATALOG - Olladiscoaster asterilithos


Folder trail: ntax_Farinacci -> O -> Olladiscoaster -> Olladiscoaster asterilithos
Folders this level: O. asterilithos, O. bordii, O. cruxii, O. cruzii, O. exagonikoasteri, O. lepidus, O. molae, O. perplexus, O. superbus, O. vestigium, O. zucchiae

Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the Farinacci & Howe Catalog of Calcareous Nannofossils. In other cases (e.g. non-calcifying haptophytes) the data is directly compiled on this site. The "Catalogue of Calcareous Nannofossils" was originally compiled by Prof A. Farinacci 1969-1989, since 2000 it has been updated and extended by Richard Howe - see The Farinacci and Howe Catalog - an Introduction.
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Current identification:

Compiled data

Citation: Olladiscoaster asterilithos Varol & Bowman 2024
Taxonomic rank: species
Type specimens: Holotype: Plate 1, Figs. 1
Type age (chronostrat): Zones NN6, Middle Miocene
Standardised type level: 140_NEOGENE
Type locality: IODP Leg 354, Hole 1451B, Core 29R, Section 4W, 58-59 cm, Ninetyeast Ridge, Bengal Fan, Indian Ocean.
Type repository: Varol Research, Llandudno
Repository Country: Wales


Original Description

Circular species of Olladiscoaster have segments without arms. On the distal side, the distinct sutural ridges are created by the deep cavities. The sutural ridges are raised towards the centre and capped by boomerang-shaped distal covers. The distinct proximal ridges with a radiating proximal knob at the centre decorate the bulged proximal side.

Size:
Dimensions of holotype: Maximum diameter: 6.90 µm, Diameter of the proximal knob: 3.40 µm (measurements from SEM micrograph).

Etymology:
From the Greek asterilithos, the star shape of rock - refers to its radiating proximal knob.

Extra details from original publication
Remarks: Olladiscoaster asterilithos is the only species with a radiating proximal knob; thus, it differs from any other Olladiscoaster. Olladiscoaster asterilithos is further differentiated from the Olladiscoaster molae group by lacking quasi-arms and, as a result, not having a stellate outline.

Occurrence: This species is recorded from ODP Leg 154, Hole 926A Ceara Rise, Atlantic Ocean, IODP Leg 354, Hole 1451B, Ninetyeast Ridge, Bengal Fan, Indian Ocean and various commercial oil wells in the Gulf of Mexico

Stratigraphic range: Middle Miocene (Zones NN5-NN6)

References:

Varol, O. & Bowman, A. R. (2024). The new Middle Miocene genus Olladiscoaster, and related and associated discoasters. Grzybowski Foundation Special Publication. 28: 1-102. gs


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Olladiscoaster asterilithos: Catalog entry compiled by Jeremy Young. Viewed: 5-3-2026

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=55764 Go to Archive.is to create a permanent copy of this page - citation notes

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