Nannotax3 - ntax_main - Peritrachelina

Nannotax3 - ntax_main - Peritrachelina Nannotax3 - ntax_main - Peritrachelina

Peritrachelina

Classification: ntax_main -> Holococcoliths -> fossil holococcoliths -> Peritrachelina
Sister taxa: Daktylethra, Holodiscolithus, Lanternithus, Multipartis, Octolithus, Quadrilateris, Semihololithus, Varolia, Youngilithus, Zygrhablithus ⟩⟨ Aubrysphaera, Corannulus, Orthozygus, Peritrachelina, Unidentified fossil holococcoliths

Daughter taxa (time control age-window is: 0-800Ma)
				Peritrachelina arenaria Large non-birefringent elliptical holococcolith comprising a perforate framework with a large central pore and 9-13 marginal pores.
				Peritrachelina joidesa C-shaped nannoliths only observed in side view. Similar in appearance to Peritrachelina elliptica, but lacking clear ridges and pores.
				Peritrachelina minuta Like Peritrachelina elliptica but with a greater number of smaller pores/perforations (~<0.5 µm).
				Peritrachelina ornata Large, solid, elliptical and ‘C’-shaped holococcoliths that have honeycomb-like ridges on one surface.
				Peritrachelina sp. Specimens which cannot be assigned to any established species

Taxonomy:

Citation: Peritrachelina Deflandre 1952

Taxonomic rank: genus

Basionym: Clathrolithus Deflandre in Deflandre & Fert, 1954

Type species: Clathrolithus ellipticus Deflandre in Deflandre & Fert, 1954

Taxonomic discussion: Peritrachelina is a senior synonym of Clathrolithus, so the taxonomy was revised by Young 2023 [JRY Aug 2014].

Synonyms:

Peritrachelina * Deflandre 1952
Clathrolithus * Deflandre, in Deflandre & Fert 1954 [following Bown (2005) this name has been widely used but, unfortunately, it is a junior synonym of Peritrachelina.]

Distinguishing features:
Parent taxon (fossil holococcoliths): Holococcolith genera only known from the fossil record
This taxon: Unusual holococcoliths with non-coccolith morphology typically comprising an elliptical, concavo-convex, domed, perforate framework.

Morphology:

Low birefringence in XPL.

Search data:

LITHS: holococcolith, asymmetric, elliptical, CROSS-POLARS: 1ou, V-prominent,

Lith size: 7->9µm;

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

Geological Range:
Last occurrence (top): at top of NP23 zone (100% up, 29.6Ma, in Rupelian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP7 zone (58.70-58.97Ma, base in Thanetian stage). Data source: Total of ranges of species in this database

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.
See also:

Parent: fossil holococcoliths

References:

Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs O

Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs

Deflandre, G. (1952a). Classe des Coccolithophoridés. (Coccolithophoridae. Lohmann, 1902). In, Grassé, P. P. (ed.) Traité de Zoologie. Masson, Paris 439-470. gs

Young, J. R. (2023). Some proposed changes to the systematics of Cenozoic and Mesozoic nannoplankton. Journal of Nannoplankton Research. 41(1): 15-25. gs

Peritrachelina compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-8-2026

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=298 Go to Archive.is to create a permanent copy of this page - citation notes

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