Taxon Account

Actinocyclus normanii (Gregory ex Greville) Hustedt ; 1957; 218


Coscinodiscus normanii Gregory ex Greville 1859

Key references


Diameter: 25-110 µm (Krammer & Lange-Bertalot 1991).

Valves circular, cells are barrel-shaped.

Central portion of one valve concave, the corresponding valve convex.

Radiating striae with large areolae, 10-13 in 10 µm (Krammer and Lange-Bertalot 1991).

Other features
Areolae on the mantle are much smaller than on the valve face.

A ring of widely and equally spaced rimoportulae (labiate processes) is present near the periphery of the valve face.


References are given in chronological order.

Greville R.K. 1859. Descriptions of new species of British Diatomaceae, chiefly observed by the late Professor Gregory. Quarterly Journal of Microscopical Science. 7: 79-86; pl. 6. Morphology; Description; Taxonomy
Hustedt F. 1957. Die Diatomeenflora des Flußsystems der Weser im Gebiet der Hansestadt Bremen. Abhandlungen des Naturwissenschaftlichen Verein zu Bremen. 34(3): 181-440; 1 pl. Morphology; Taxonomy; Illustrations; Ecology
Dijkman N.A., Kromkamp J.C. 2007. Photosynthetic characteristics of the phytoplankton in the Scheldt estuary: community and single-cell fluorescence measurements. European Journal of Phycology. 41(4): 425-434. Biology
This page should be cited as:

Mann D. G., Jüttner I. Actinocyclus normanii (Gregory ex Greville) Hustedt ; 1957; 218. In: Jüttner I., Carter C., Chudaev D., Cox E.J., Ector L., Jones V., Kelly M.G., Kennedy B., Mann D.G., Turner J. A., Van de Vijver B., Wetzel C.E., Williams D.M.. Freshwater Diatom Flora of Britain and Ireland. Amgueddfa Cymru - National Museum Wales. Available online at [Accessed:  ].

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Record last modified: 27/12/2020