Actinocyclus octonarius Ehrenberg 1838

A&B = Two living cells; C&D = Valve (arrowhead=pseudonodulus, arrows=labiate processes). (A=BF, B-D=DIC)

Var.tenellus (SEM)

Synonym(s): Actinocyclus ehrenbergii Ralfs in Pritchard 1861

Life-form: Solitary

Size: Diameter = 50-300 µm, var. tenellus 18-48 µm

Resting spore:

Note: Several varities are described. Botten form which can be common in coastal plankton

Distinctive features:

Similar species:

Distribution: Worldwide

Drebes, G. 1974. Marines Phytoplankton, Eine Auswahl der Helgoländer Planktonalgen (Diatomeen, Peridineen). Georg Thieme Verlag, Stuttgart. 186 pp.

Hasle, G. R. & Syvertsen, E. E. 1996. Marine diatoms. In: Tomas, C. R. (ed.) Identifying marine diatoms and dinoflagellates. Academic Press, Inc., San Diego, p. 5-385.

Hendey, N. I. 1964. An introductory account of the smaller algae of British coastal waters. Part 5: Bacillariophyceae (Diatoms). HSMO, London. 317 pp.

  Copyright © 1996-2006, Mats Kuylenstierna & Bengt Karlson All rights reserved.
Last modified on 15 September, 2006

Swedish Meteorological and Hydrological Institute

Department of Marine Ecology, Göteborg University, Sweden