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CATALOG - Calciperidinium asymmetricum


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Original descriptions of taxa - also emended descriptions for a few 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/main database link: Calciperidinium asymmetricum Versteegh 1993

Compiled data

Citation: Calciperidinium asymmetricum Versteegh 1993
Taxonomic rank: species
Type specimens: Cyst no. T20-S1/80-81/106, SEM micrographs 316-322 (Plate II, 1-3).
Type sample (& lithostrat): Piston core T87-2-20G,
Type age (chronostrat): Upper Pleistocene, sapropel S5, ca. 120,000a
Type locality: southern continental margin of Crete, 34°58 ', 4 N, 23°.44 ', 8E.
Type repository: Utrecht: Laboratory of Palaeobotany and Palynology, University of Utrecht,
Repository Country: Netherlands
Farinacci catalog page (& compiler): 16>3

Combinations:
  • Calciperidinium asymmetricum Versteegh 1993 (basionym)


    • Original Description

    Diagnosis: Obliquipithonelloid dinoflagellate cysts with a subspherical endocoel and a peridinioid outline. Tabulation is only indicated by the archaeopyle.

    Description: Calcareous dinoflagellate cysts having a subspherical endocoel (light-microscopic obser- vations), one apical and two antapical lobes, and a wall composed of numerous randomly orientated calcite needles. The subspherical endocoel has an asymmetrical position. In consequence, the lower part of the cyst is solid as is the apex. The archaeopyle is located on the dorsal side of the cyst, just below the apex. It is probably formed by the loss of one or more intercalary plates. On the cyst surface, areas with a fine granulate structure (formed by the distal ends of the rodlike wall crystals), may alternate with more coarsely granu- late areas (due to horizontal overgrowth and fusion of the crystal ends).

    Size:
    Holotype: length 40 gm, width 28 µm, height 25 µm. Other specimens: length 36-45 µm, width 23-30 µm. n = 4

    Etymology:
    Greek, a-symmetros, not- fitting. With reference to the position of the endocoel

    Extra details from original publication
    Occurrence: Frequent in core T87-2-20G, southern continental margin of Crete, upper Pleistocene. Also known from recent coastal sediments of South Carolina and the Upper Quaternary of the Black Sea (Wall et al., 1973).

    Comparison: This species is the only calcareous dinoflagellate cyst known with a peridinioid outline. Obliquipithonella usheri (Krasheninnikov et Basov, 1983) Keupp, 1987, may also have an asymmetrical archaeopyle but it lacks a peridinioid shape. The structure of the cyst wall, with distal expansion of the calcite crystals on the cyst surface, corresponds with Obliquipithonella patriciagree-leyae (Bolli, 1974) Keupp et Mutterlose, 1984 (see Keupp, 1980a).

    Remark: Due to the position of the archaeopyle, the apex is easily removed from the rest of the cyst. As a consequence damaged cysts seem to possess an apical archaeopyle.

    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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    Calciperidinium asymmetricum: Catalog entry compiled by <% compiler %>. Viewed: 14-9-2026

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