Discoaster leios

Varol & Bowman, 2024 Jan 31, 2025

Set number: 697

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10µm

ODP Leg 154, Site 925C, Ceara Rise, Equatorial Atlantic Ocean

Holotype

Set number: 696

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10µm

ODP Leg 154, Hole 926A, Ceará Rise, western equatorial Atlantic.

Set number: 698

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10µm

ODP Leg 154, Site 925C, Ceara Rise, Equatorial Atlantic Ocean

Final Epithet

Discoaster leios Varol & Bowman, 2024

Basionym

Discoaster leios Varol & Bowman, 2024

Diagnosis

Six segmented discoasters have short, robust arms with a wide bifurcation. The inter-arm area is narrow and rounded. Wide proximal ridges decorate the strongly bulged proximal side, whilst the distal side is smooth without any decoration.

Etymology

From the Greek leios, smooth - refers to its appearance in the plan view.

Dimensions Of Holotype

Maximum diameter: 6.54 µm, Diameter of the central area: 4.16 µm, Length of the arms: 1.19 µm, Maximum height: 6.16 µm (measurements from bright field micrograph).

Remarks

Discoaster leios differs from Discoaster premicros by having a strongly bulged proximal side and rounded inter-arm areas, whereas the latter has a gently bulged proximal side and V-shaped inter-arm areas.

References

Varol, O. & Bowman, A. R. 2024. The New Middle Miocene Genus Olladiscoaster, and Related and Associated Discoasters. Grzybowski Foundation Special Publication, 28, 103 pp.