Sphenolithus spinula


Classification: ntax_cenozoic -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. heteromorphus group -> Sphenolithus spinula
Sister taxa: S. heteromorphus, S. milanetti, S. preasii ⟩⟨ S. belemnos ⟩⟨ S. pseudoheteromorphus, S. conicus, S. calyculus ⟩⟨ S. delphix, S. microdelphix, S. spinula

Taxonomy:

Citation: Sphenolithus spinula Bergen & de Kaenel, in Bergen et al. 2017
Rank: species

Distinguishing features: Like S. delphix, but smaller (<8 µm) and with short spine

Farinacci & Howe catalog pages: S. spinula *


Morphology: Like S. delphix but smaller and with short spine.

Size: The spine is short, approximately 1/2 of the total length of the specimen (spine to specimen length ration is 0.46–0.57). Proximal cycle width ca 1.5–2.0x lateral cycle width. The proximal surface is concave. L = 2.2–5.4 µm; W = 2.6–5.4 µm (holotype: 5.2 µm x 5.2 µm). [Bergen et al 2017]

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CA: process, CROSS-POLARS: R-prominent,
MetricsLith size: 2->6µm;
Data source notes: Bergen et al 2017
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: According to Bergen et al (2017) S. spinula and S. microdelphix have similar ranges.
Last occurrence (top): in mid part of NN2 zone (50% up, 20.9Ma, in Burdigalian stage). Data source: Bergen et al 2017
First occurrence (base): in mid part of NP25 zone (50% up, 25.6Ma, in Chattian stage). Data source: Bergen et al 2017

Plot of occurrence data:

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


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Sphenolithus spinula compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-4-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1614 Go to Archive.is to create a permanent copy of this page - citation notes



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