Sphenolithus avis

Classification: ntax_cenozoic -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. predistentus group -> Sphenolithus avis
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


Citation: Sphenolithus avis Aljahdali et al. 2015
Rank: Species

Distinguishing features: Similar to S. ciperoensis but with minute spine and flaring base

Farinacci & Howe catalog pages: S. avis *

Morphology: "Sphenolithus avis n. sp. is easily distinguished from S. ciperoensis and other Sphenolithus species by much more flared basal (proximal) elements (Plate 2, Figure 2). The flared base is similar in S. umbrellus, but S. avis differs from this species by having a short apical spine" (Aljahdali et al. 2015)

See also: Sphenolithus milanetti - similar shape but with compound spine;

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CA: process, CROSS-POLARS: V-prominent, R-prominent,
MetricsLith size: 4->7µm;
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:
Notes: FAD occurs within NP23, ie below that of S. ciperoensis (Aljahdali et al. 2015)
Last occurrence (top): within NP25 zone (24.40-26.84Ma, top in Chattian stage). Data source: Aljahdali et al. 2015
First occurrence (base): at base of NP23 zone (0% up, 32Ma, in Rupelian stage). Data source: Aljahdali et al. 2015

Plot of occurrence data:


Aljahdali, M., Wise, S. W., Bergen, J. A. & Pospichal, J. J. (2015). A new biostratigraphically significant Late Oligocene Sphenolithus species from the equatorial region. Micropaleontology. 61(3): 193-197. gs

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


Sphenolithus avis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-1-2021

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1283 Go to Archive.is to create a permanent copy of this page - citation notes

Comments (1)

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Mohammed Aljahdali (Tallahassee, US)
Thanks Jeremy for posting this at the NANNOTAX3. Under the stratigraphic distribution it should be FAD rather than LAD.

Many thanks again,
Jeremy Young (UCL, UK)
OK I have corrected the FAD/LAD error.
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