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Name derivation:

Greek Cal meaning beautiful, neis meaning plankton.


Caloneis  Cleve  1894;  100 of 330 species descriptions are currently accepted taxonomically (Guiry and Guiry 2014).

Order Naviculales;  Family Naviculaceae


Unicellular biraphe symmetric diatom with relatively flat valve faces.  Wide area surrounding raphe in the center of the valve face bordered by short striations.  Area becomes smaller toward both poles where cell tapers.  Many species capitates at both ends.

Similar genera:

General symmetry is similar to Navicula and some species are similar to Pinnularia species..


Freshwater, estuarine and marine.



Cleve, P.T. (1894). Synopsis of the naviculoid diatoms. Part I. Kongliga Svenska Vetenskapsakademiens Handlingar, series 4 26(2): 1-194, 5 pl.

Guiry, M.D. and G.M. Guiry  2013.  AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.  http://www.algaebase.org; searched on 22 May 2013.