Nannotax3 - ntax_Farinacci - Pseudopithonella striatula Nannotax3 - ntax_Farinacci - Pseudopithonella striatula

CATALOG - Pseudopithonella striatula


Folder trail: ntax_Farinacci -> Calcispheres -> Pseudopithonella -> Pseudopithonella striatula
Folders this level: P. striatula

Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the Farinacci & Howe Catalog of Calcareous Nannofossils. In other cases (e.g. non-calcifying haptophytes) the data is directly compiled on this site. The "Catalogue of Calcareous Nannofossils" was originally compiled by Prof A. Farinacci 1969-1989, since 2000 it has been updated and extended by Richard Howe - see The Farinacci and Howe Catalog - an Introduction.
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Current identification:

Compiled data

Citation: Pseudopithonella striatula Versteegh 1993
Taxonomic rank: species
Type specimens: Holotype: Cyst no. T20-/87-88/1, SEM micrographs 5, 6, 13 (Plate IX, 3, 4).
Type sample (& lithostrat): Piston core T87-2-20G
Type age (chronostrat): Upper Pleistocene, sapropel , 76,000 a.
Type locality: southern continental margin of Crete, 34°.58' N, 23°.44'E.
Type repository: Utrecht: Laboratory of Palaeobotany and Palynology, University of Utrecht, The Netherlands
Repository Country: NL
Farinacci catalog page (& compiler): 16>3


Original Description

Diagnosis: A spherical to subspherical cyst of Pseudopithonella. The crystals of the unidirectional areas are arranged in parallel rows. The direction of these rows is different for each area.

Description: Orthopithonelloid calcareous dinoflagellate cysts having a subspherical endocoel and shape. The crystals within the "unidirectional areas" (areas in which all crystals have the same orientation) are arranged in parallel rows. On the cyst surface, these crystals may have a rod like appearance. In each row the long sides of these "rods" have a parallel orientation. Along the borders of the unidirectional areas these rows may be broken down and a random crystal orientation may be observed. On cross-section the single layered cyst wall shows a dense structure of randomly orientated, often plate-like, crystals

Size:
Holotype: width 59 µm, thickness wall 9 µm. Other specimens: width 57-52 µm, thickness wall 6.4 µm. n = 2. Length-width ratio of surface crystals 3-6.

Etymology:
Latin, striatus, striation. With reference to the striate appearance of the cyst surface.

Extra details from original publication
Occurrence: Common in core T87-2-20G, southern continental margin of Crete, upper Pleistocene.

Comparison: This form differs from all other described calcareous dinoflagellate cysts by its pseudopithonelloid surface structure.

References:

Versteegh, G. J. M. (1993). New Pliocene and Pleistocene calcareous dinoflagellate cysts from Southern Italy and Crete. Review of Palaeobotany and Palynology. 78: 353-380. gs


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Pseudopithonella striatula: Catalog entry compiled by <% compiler %>. Viewed: 14-6-2025

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