Sphenolithus umbrellus


Classification: Coccolithophores -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. predistentus group -> Sphenolithus umbrellus
Sister taxa: S. ciperoensis, S. distentus, S. predistentus, S. patifunditus, S. bulbulus, S. tawfikii, S. celsus, S. peartiae, S. akropodus, S. tribulosus, S. directus, S. avis, S. umbrellus, S. triangularis, S. intercalaris, S. obtusus,

Taxonomy:

Citation: Sphenolithus umbrellus (Bukry, 1971) Aubry and Knuttel, in Knuttel 1986
Rank: Species
Basionym: Catinaster umbrellus Bukry, 1971
Notes & discussion: Although this looks like a broken relic of a lrger sphenolith it seems to have a restricted range so it probably is a species in which the upper cycles became reduced

Distinguishing features: Proximal shield only, formed of about ten rays with umbrella-like appearance

Farinacci & Howe catalog pages: Catinaster umbrellus *

Search data:
TagsLITHS: nannolith-radiate, N: 3D-radiate, conical, circular, RIM: tiered,
CSPH: not known, V-UNITS: none, R-UNITS: all, lower-tier, spine, middle-tier, DETAILS: isogyres radial,
MetricsLith size: 8->12µm;
Sources: lith height from OD
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NN1 zone (22.82-23.13Ma, top in Aquitanian stage). Data source: Maiorano & Monechi 1998
First occurrence (base): within Late Oligocene Sub-Epoch (23.03-28.09Ma, base in Chattian stage). Data source: original description

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Sphenolithus umbrellus, synonyms included - Catinaster umbrellus; Sphenolithus umbrellus; space-time plot :: Samples map :: Parent: S. predistentus group

    References:

    Bergen, J. A., de Kaenel, E., Blair, S. A., Boesiger, T. M. & Browning, E. (2017). Oligocene-Pliocene taxonomy and stratigraphy of the genus Sphenolithus in the circum North Atlantic Basin: Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research. 37(2-3): 77-112. gs

    Bukry, D. (1971a). Discoaster evolutionary trends. Micropaleontology. 17: 43-52. gs

    Knuttel, S. (1986). Calcareous nannofossil biostratigraphy of the Central East Pacific Rise, Deep Sea Drilling Project Leg 92: evidence for downslope transport of sediments. Initial Reports of the Deep Sea Drilling Project. 92: 255-290. gs

    Maiorano, P. & Monechi, S. (1998). Revised correlations of early and middle Miocene calcareous nannofossil events and magnetostratigraphy from DSDP Site 563 (North Atlantic Ocean). Marine Micropaleontology. 35(235-255): -. gs


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    Sphenolithus umbrellus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-9-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1326 Go to Archive.is to create a permanent copy of this page - citation notes



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