Gorkaea pseudanthophorus

(Bramlette & Martini, 1964) Varol & Girgis, 1994 Jun 09, 2025

Set number: 1249

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10µm

CB06 C-T, Cauvery Basin, India

Set number: 1248

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10µm

CB06 C-T, Cauvery Basin, India

Set number: 1247

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10µm

CB06 C-T, Cauvery Basin, India

Set number: 1243

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Paipa Creek, Colombia

Set number: 1231

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10µm

Unknown

Set number: 1230

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Unknown

Set number: 1229

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10µm

Culver Cliff, Isle of Wight, South England

Set number: 1228

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Culver Cliff, Isle of Wight, South England

Set number: 1225

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10µm

Agua Blanca, Colombia

Set number: 1223

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10µm

Agua Blanca, Colombia

Final Epithet

Gorkaea pseudanthophorus (Bramlette & Martini, 1964) Varol & Girgis, 1994

Basionym

Zygodiscus? pseudanthophorus Bramlette & Martini, 1964

Synonyms

Zygodiscus lacunatus Gartner, 1968

Remarks

This species is often erroneously placed in Zeugrhabdotus embergeri; its structural units and optical properties are distinctly different. In Gorkaea pseudanthophorus, the outer wall is narrow and tapers distally, and the wider inner wall gently tapers proximally. Both walls are visible in the plan view.

In contrast, the outer and proto-inner walls are similar in width in Zeugrhabdotus embergeri; the outer wall tapers proximally, and the proto-inner wall tapers distally. Additionally, in Zeugrhabdotus embergeri, the proto-inner wall cannot be seen from the plan view.

References

Bramlette, M. N. & Martini, E. 1964. The great change in calcareous nannoplankton fossils between the Maastrichtian and Danian. Micropaleontology. 10(2): 291-322.

Gartner, S., 1968. Coccoliths and related calcareous nannofossils from Upper Cretaceous deposits of Texas and Arkansas. University of Kansas Paleontological Contributions, Articles 48 (Protista 1), 1-56.

Varol, O. & Girgis, M. 1994. New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 192: 221-253.

Taxonomy

Gorkaea

Biostratigraphy

Stratigraphic Range

Early Tithonian - Late Maastrichtian

Age (Ma)

147.45 - 66.04

Zone(s)

JC23 - CC26

Holotype

Zygodiscus? pseudanthophorus Bramlette & Martini, 1964

Late Maastrichtian

Prairie Bluff Formation, Alabama, USA