Nannotax3 - ntax_Farinacci - Olladiscoaster bordii Nannotax3 - ntax_Farinacci - Olladiscoaster bordii

CATALOG - Olladiscoaster bordii


Folder trail: ntax_Farinacci -> O -> Olladiscoaster -> Olladiscoaster bordii
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 bordii Varol & Bowman 2024
Taxonomic rank: species
Type specimens: Holotype: Plate 3, Figs. 1-24 (same specimen in mobile mount).
Type age (chronostrat): Zone NN6, Middle Miocene.
Standardised type level: 140_NEOGENE
Type locality: USGS-NASA Langley core Hampton, VA, USA, 134.4 cm.
Type repository: Varol Research, Llandudno
Repository Country: Wales


Original Description

Circular to hexagonal 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 kite-shaped distal covers. The distinct proximal ridges with a petaloid knob at the centre decorate the bulged proximal side. In the side view, Olladiscoaster bordii resembles a bouquet.

Size:
Dimensions of holotype: Maximum diameter: 5.75 µm, Maximum height: 4.37 µm; Diameter of the proximal knob: 3.76 µm, Height of the proximal knob: 1.08 µm (measurements from bright field micrograph).

Etymology:
In honour of Dr. David Bord, nannofossil specialist, Ellington Geological Services, Houston, Texas, USA.

Extra details from original publication
Remarks: Olladiscoaster bordii differs from Olladiscoaster cruzii, Olladiscoaster catinatus and Olladiscoaster asterilithos by having a kite-shape distal cover, whereas the latter species have boomerang shape distal covers. Olladiscoaster bordii is distinguished from Olladiscoaster perplexus and Olladiscoaster zucciae by having a petaloid proximal knob, whilst the latter species have hexagon proximal knobs. Olladiscoaster exagonikoasteri and Olladiscoaster catinatus lack a proximal knob.

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, USGS-NASA Langley core 134.4 m, Hampton, VA, USA 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 bordii: Catalog entry compiled by Jeremy Young. Viewed: 5-3-2026

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