Nannotax3 - ntax_Farinacci - Discoaster diplasiastike Nannotax3 - ntax_Farinacci - Discoaster diplasiastike

CATALOG - Discoaster diplasiastike


Folder trail: ntax_Farinacci -> D -> Discoaster -> Discoaster diplasiastike
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Original descriptions of taxa - also emended descriptions for a few 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: Discoaster diplasiastike Varol & Bowman 2024
Taxonomic rank: species
Type specimens: Holotype: Plate 37, Figs. 1-20 (same specimen in mobile mount).
Type age (chronostrat): Zone NN6, Middle Miocene.
Type locality: USGS-NASA Langley core in Hampton, VA, USA, 134.40 m.
Type repository: Varol Research, Llandudno
Repository Country: Wales

Combinations:
  • Discoaster diplasiastike Varol & Bowman 2024 (basionym)


    • Original Description

    Species have a large central area with sutural and distal ridges, deep cavities on the distal side, and a bulged proximal side with a platform created by ridges. The parallel-sided arms terminate in double bifurcation. Description: The arms of the segments are much shorter than the diameter of the central area (about half). The segments terminate with bifurcation made by double limbs. The pre-terminal limbs are perpendicular to the length of the segments, but the terminal limbs make an obtuse angle with the length of the segments. The angle between the terminal limbs is acute (about 50-70°). The inner arm area is half-moon in shape. The distal side is ornamented with prominent sutural ridges, deep cavities and distal ridges. The ridges create a proximal platform to decorate the bulged proximal side.

    Size:
    Dimensions of holotype: Maximum diameter: 11.35 µm, Diameter of the central area: 6.36 µm, Length of the arms: 2.49 µm, Maximum height: 5.82 ?m (measurements from bright field micrograph).

    Etymology:
    From the Greek diplasiastike, doubled - refers to double limbs of the bifurcation at the end of the segments.

    Extra details from original publication
    Remarks: Discoaster diplasiastike differs from double-limbed bifurcated Discoaster emblematicus, Discoaster saundersii and Discoaster durioi by having a proximally bulged central area with proximal ridges and a platform and distal ridges. It is further distinguished from Discoaster saundersii by having sutural ridges and cavities on the distal side. Discoaster diplasiastike is differentiated from Discoaster mendomobensis by having double-limbed bifurcation and a proximally bulged central area with proximal ridges and a platform and distal ridges.

    Occurrence: This species is recorded from the Atlantic Ocean, IODP Leg 354, Hole 1451B, Ninetyeast Ridge, Bengal Fan, Indian Ocean, USGS-NASA Langley core in Hampton, VA, USA, Malta 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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    Discoaster diplasiastike: Catalog entry compiled by Jeremy Young. Viewed: 8-10-2026

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