Nannotax3 - ntax_Farinacci - Discoaster bordii Nannotax3 - ntax_Farinacci - Discoaster bordii

CATALOG - Discoaster bordii


Folder trail: ntax_Farinacci -> D -> Discoaster -> Discoaster bordii
Folders this level: << < D. backmanii, D. barbadiensis, D. bellus, D. bengalica, D. bergenii, D. berggrenii, D. berggrenii extensus, D. bifax, D. bifidus, D. binodosus, D. binodosus binodosus, D. binodosus hirundinus, D. blackstockae, D. bolivariae, D. bollii, D. bordii, D. borroi, D. boulangeri, D. braarudii, D. bramlettei, D. breviloeblichii, D. bronnimanni, D. brouweri, D. brouweri bipartitus, D. brouweri picentinus, D. brouweri recurvus, D. brouweri rutellus, D. calcaris, D. calculosus, D. capricornensis, D. carneyi> >>

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: Discoaster bordii Varol 2023
Taxonomic rank: species
Type specimens: Plate 24, Figs. 1-12 [same specimen in mobile mount.]
Type sample (& lithostrat): DSDP Leg 39, Site 354-16-1, 46 cm.
Type age (chronostrat): Thanetian, Zone NP9
Standardised type level: 093_UPPER PALEOCENE
Type locality: Ceara Rise, Atlantic Ocean
Type repository: not stated, presumalby the author's collection
Repository Country: Wales, UK


Original Description

Diagnosis: A large (8.0–13.0 μm) circular species of Discoaster with a non-birefringent lenticular disc and a solid non-birefringent, disjunct proximal structure.

Description: The number of segments that make up the disc is between 19 and 32 and are joined along most of their length. In side view, the relatively narrow proximal structure is often parallel-sided and has a slightly concave proximal end.

Size:
Dimensions of holotype: The diameter of the disc =12.11 μm, the thickness of the disc =4.25 μm, the diameter of the proximal structure =4.02 μm, the height of the proximal structure =2.31 μm; all measured in phase-contrast.

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

Extra details from original publication
Remarks: Discoaster bordii is distinguished from Discoaster multiradiatus by having a solid, discrete proximal structure. Discoaster bordii differs from Candeodiscoaster protomultiradiatus in that it has a solid proximal structure and lacks tube cycle.

Occurrence: This species is recorded from DSDP Leg 39, Site 354, Ceara Rise, Atlantic Ocean; DSDP Leg 25, Site 245A, Mozambique Channel (Davie Ridge); DSDP Leg 25, Site 245A, Mozambique Channel (Davie Ridge), Indian Ocean; ODP Leg 171, Site 1051A, Blake Nose, western North Atlantic Ocean.

Stratigraphic range: Thanetian (Zone NP9).

References:

Varol, O. (2023). New Paleocene calcareous nannofossils: Carlamuelleria, Davidbukrya, Mauriceblackia, Noelia and Senelia. Marine Micropaleontology. 180: 1-41. gs


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Discoaster bordii: Catalog entry compiled by <% compiler %>. Viewed: 20-7-2025

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