Nannotax3 - ntax_Farinacci - Calcidiscus gallagheri Nannotax3 - ntax_Farinacci - Calcidiscus gallagheri

CATALOG - Calcidiscus gallagheri


Folder trail: ntax_Farinacci -> C -> Calcidiscus -> Calcidiscus gallagheri
Folders this level: C. bicircus, C. edgariae, C. ellipticus, C. gallagheri, C. gerrardii, C. henrikseniae, C. kamikurii, C. medusoides, C. nodosus, C. obscurus, C. odebodea, C. parvicrucis, C. parvus, C. premacintyrei, C. quadriforatus, C. randeus, C. salamis, C. salomonii, C. scullyae, C. uniforatus

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/main database link: Calcidiscus gallagheri da Gama & Varol 2013

Compiled data

Citation: Calcidiscus gallagheri da Gama & Varol 2013
taxonomic rank: Species
Language: Engl
Described on page(s) : 3
Type specimens: Holotype: Plate 2, figures 3-4 (same specimen) Paratype: Plate 2, figures 5-6 (same specimen)
Type sample (& lithostrat): DSDP, 242-9-4, 130cm
Type age (chronostrat): Zone NP25, upper Oligocene
Standardised type level: 112_UPPER OLIGOCENE
Type locality: Mozambique Channel, W. Indian Ocean
Type repository: authors collection
Repository Country: USA
Farinacci catalog page (& compiler): n/a
Current citation: Calcidiscus gallagheri da Gama & Varol 2013


Original Description

Diagnosis: Elliptical species of Calcidiscus with large central area covered by a finely porous plate. Description: This elliptical Calcidiscus has a relatively large central area covered by a finely porous plate. The distal shield and porous plate are non-birefringent whereas the proximal shield is smaller and weakly birefringent under polarised light. No tube cycle was noted. In some specimens, the central porous plate displays a longitudinal suture. However, this suture might be the result of poor preservation.

Size:
Holotype: Length: 11.6μm, Width: 10.0μm Length of central area: 4.0μm Width of central area: 2.4μm

Etymology:
In honour of Dr. Liam Gallagher, nannofossil specialist and good friend, Network Strati- graphic Consulting Ltd, Potters Bar, UK

Extra details from original publication
Remarks: This species looks similar to Calcidiscus premacintyrei but differs from it by having a finely porous plate in the central area. Moreover, C. premacintyrei is restricted to upper Zone NN4 to Zone NN7 in the Miocene whilst C. gallagheri is restricted to Zone NP25 in the Oligocene.

Occurrence: This species is only found in Zone NP25, Late Oligocene of DSDP, Leg 242/9-4, 130cm.

References:

da Gama, R. O. B. P. & Varol, O. (2013). New Late Oligocene to Miocene Species. Journal of Nannoplankton Research. 33(1): 1-12. gs


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Calcidiscus gallagheri: Catalog entry compiled by Jeremy Young. Viewed: 6-10-2024

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