Sphenolithus procerus
Classification: ntax_cenozoic -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. dissimilis group -> Sphenolithus procerus
Sister taxa: S. disbelemnos, S. dissimilis, S. procerus, S. tintinnabulum, S. paratintinnabulum, S. truaxii
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Taxonomy:
Citation: Sphenolithus procerus Maiorano & Monechi 1997Rank: Species
Distinguishing features: cylindroconical with long spine and low base
Farinacci & Howe catalog pages: S. procerus *
Morphology: Sphenolithus procerus is distinguished from S. dissimilis by its longer apical spine (length spine to base ratio > 1.0). Because of its shorter base, the extinction lines of S. procerus cross and are strongly divergent when specimens are oriented 45° to the polarizer. S. procerus also tends to have a broader spine than S. dissimilis (width of spine to base ratio > 0.50) [Bergen et al. 2017]
Search data:
| Tags | LITHS: nannolith-radiate, circular, cylindrical, CA: process, CROSS-POLARS: R-prominent, |
| Metrics | Lith size: 4->6µm;
Data source notes: 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 NN3 zone (17.95-19.00Ma, top in Burdigalian stage). Data source: Bergen et al. 2017
First occurrence (base): within NP24 zone (26.84-29.62Ma, base in Rupelian stage). Data source: Bergen et al. 2017
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
- (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: S. dissimilis 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 V O
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 V O
Maiorano, P. & Monechi, S. (1997). New Early Miocene species of Sphenolithus Deflandre, 1952 from the North Atlantic Ocean. Journal of Nannoplankton Research. 19(2): 103-107. gs V O
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
Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs V O
