Nannotax3 - ntax_cenozoic - Umbilicosphaera detecta

Nannotax3 - ntax_cenozoic - Umbilicosphaera detecta Nannotax3 - ntax_cenozoic - Umbilicosphaera detecta

Umbilicosphaera detecta

Classification: ntax_cenozoic -> Coccolithales -> Calcidiscaceae -> Umbilicosphaera -> Umbilicosphaera detecta
Sister taxa: U. anulus, U. foliosa, U. hulburtiana, U. sibogae ⟩⟨ U. jafari, U. rotula ⟩⟨ U. bramlettei, U. jordanii, U. protoannulus ⟩⟨ U. detecta, U. edgariae, U. henrikseniae, U. sp.

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Taxonomy:

Citation: Umbilicosphaera detecta (de Kaenel & Villa, 1996) Young & Bown 2014

taxonomic rank: Species

Basionym: Ericsonia detecta de Kaenel & Villa, 1996

Synonyms:

Calcidiscus? detectus (de Kaenel & Villa, 1996) Bown & Dunkley Jones, 2012

Variants:

Calcidiscus? ellipticus Shamrock & Watkins 2012 = Umbilicosphaera elliptica (Shamrock & Watkins 2012) Bown & Newsam 2017 [virtually identical but older]

De Kaenel & Mojon (2023) separate C. ellipticus from U. detecta on the grounds that the distal shield elements are visible in phase contrast in C. ellipticus but not in U. detecta. They document the two forms as overlapping in range but state that the LAD of U. detecta, within NP21, is of stratigraphic value.

Taxonomic discussion: Similar to Umbilicosphaera protoannulus but strongly elliptical, and to Umbilicosphaera edgariae Bown & Dunkley Jones, 2012, but with narrower shields. Transferred to Umbilicosphaera by Young & Bown (2014) since it has a wide central area (central area width >25% of distal shield width).

Distinguishing features:
Parent taxon (Umbilicosphaera): Central area open
This taxon: Medium to large (~5-9 microns), elliptical placolith coccoliths with narrow bicyclic rim (in XPL) and wide, apparently vacant, central area. The rim width is around half that of the central area (rim width/central area width: 0.5-0.7).

Farinacci & Howe catalog pages: E. detecta * , C. ellipticus *

Search data:

LITHS: placolith, elliptical, CA: vacant,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,

Lith size: 5->9µm;

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Bown & Newsam (2017) argue that there is a disjunct range betwen Oligo-Miocene forms (U. detecta) and Middle Eocene forms (U. elliptica). Shamrock & Watkins (2012), however, reported occurrences throughout the Eocne (NP14 to NP21).
Last occurrence (top): within Miocene Epoch (5.33-23.03Ma, top in Messinian stage). Data source: de Kaenel & Villa, 1996
First occurrence (base): within NP14b subzone (46.29-47.84Ma, base in Lutetian stage). Data source: Shamrock & Watkins (2012)

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Umbilicosphaera detecta, synonyms included - Ericsonia detecta; Umbilicosphaera detecta;
See also space-time plot :: Samples map :: Parent: Umbilicosphaera

References:

Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs O

Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs O

De Kaenel, E. & Mojon, P. -O. (2023). Calcareous nannofossil biostratigraphy of the Eocene/Oligocene boundary (Zones NP19–21) in the parautochthonous Subalpine UMM of the Swiss Molasse Basin (Canton Fribourg, Western Switzerland). Journal of Nannoplankton Research. 41(2): 64-96. gs O

de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 79-145. gs O

Jones, A. P. & Dunkley Jones, T. (2020). Middle Eocene to Early Oligocene calcareous nannofossils from the Nanggulan Formation, Java, Indonesia. Journal of Nannoplankton Research. 38(1): 57-79. gs

Perch-Nielsen, K. (1977). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs O

Shamrock, J. L. & Watkins, D. K. (2012). Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, Eastern Indian Ocean (ODP Site 762). Stratigraphy. 9(1): 1-11. gs

Young, J. R. & Bown, P. R. (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research. 33(1): 39-46. gs