Nannotax3 - ntax_cenozoic - Dicrateria rotunda

Citation: Dicrateria rotunda (Reynolds 1974) Bendif & Probert, in Bendif et al. 2013

Basionym: Imantonia rotunda Reynolds 1974

Taxonomic discussion: This species has mostly been referedto in the literature as <em> Imantonia rotunda</em>. It was discussed and revised by Green & Pienaar (1977). Edvardsen et al. (2000) placed it in the Prymensiales based on molecular genetic results but this was reversed by Bendif et al. (2013) based on new molecular genetic work, which also demonstrated that it was very closely related to Dicrateria inornata.

Original description: Cells motile, more or less spherical, 3-4 µm in diameter, not metabolic. Flagella two, smooth, homodynamic, 1-1½ cell diameters in length; haptonema not found. Two golden-brown parietal chloroplasts in younger cells, sometimes four or five in older cells, with embedded pyrenoids. Cell body bearing circular scales with coarse radial fibrils on their proximal faces; diameter approximately 0.5 µm

Morphology: Cell spherical; Flagella equal, haptonema absent; Scales plate-like (2 types) with radial ribs (few) some concentric ribs; Pyrenoids immersed, traversed by thylakoids (Edvardsen et al. 2011)

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: [JRY]

References:

Bendif, E. M., Probert, I, Schroeder, D. C. & de Vargas, C. (2013b). On the description of Tisochrysis lutea gen. nov. sp. nov. and Isochrysis nuda sp. nov. in the Isochrysidales, and the transfer of Dicrateria to the Prymnesiales (Haptophyta). Journal of Applied Phycology. 25: 1763-1776. gs

Edvardsen, B., Eikrem, W., Green, J. C., Andersen, R. A., Moon-Van Der Staay, S. Y. & Medlin, L. K. (2000). Phylogenetic reconstructions of the Haptophyta inferred from 18S ribosomal DNA sequences and available morphological data. Phycologia. 39: 19-35. gs

Edvardsen, B., Eikrem, W., Throndsen, J., Sáez, A. G., Probert, I. & Medlin, L. K. (2011). Ribosomal DNA phylogenies and a morphological revision provide the basis for a revised taxonomy of the Prymnesiales (Haptophyta). European Journal of Phycology. 46(3): 202-228. gs V O

Green, J. C. & Pienaar, R. N. (1977). The taxonomy of the order Isochrysidales (Prymnesiophyceae) with special reference to the genera Isochrysis Parke, Dicrateria Parke and Imantonia Reynolds. Journal of the Marine Biological Association of the United Kingdom. 57: 7-17. gs

Parke, M. (1949). Studies on marine flagellates. Journal of the Marine Biological Association of the United Kingdom. 28: 255-288. gs

Tags	LITHS:
Metrics	Lith size: 0->0µm; Data source notes: RCC

Dicrateria rotunda

References:

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