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Name derivation:



Chrysodidymus  Prowse  1962;  both two species descriptions are currently accepted taxonomically (Guiry and Guiry 2013).

Order Synurales;  Family Synuraceae



Colony of two heterokont cells attached at their base. Cells are elongated, somewhat triangular and surrounded by silia scales that have spines near the outer ends. Each cell has two flagella, one being shorter than the other one.

Each cell contains two golden chloroplasts.


Similar genera:

Synura sphagnicola has similar body scale structure, as well as distinctive linear or clavate scales on both flagella, a [relatively loose scale case[, and acidophilic habitat.  The species also has pyrenoids and axial plastids, while Chrysodidymus synuroideus lacks pyrenoids and has peripheral plastids (Graham, Graham and Wujek 1993).



Widely distributed but in low concentration  in North America from Canada to Louisiana (Siver 2003).  Not reported from the British Isles (John et al. 2002).



Graham, L.E., J.M. Graham and D.E. Wujek  1993.  Ultrastructure of Chrysodidymus synuroideus (Synurophyceae).  Journal of Phycology 29:330-341.

Guiry, M.D., and G.M. Guiry  2013.  AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.  http://www.algaebase.org; searched on 16 January 2013.

John, D.M., B.A. Whitton, and A.J. Brook  2002.  The freshwater algal flora of the British Isles.  Cambridge Press. (702 pp.)

Prowse, G.A.  1962.  Further Malayan freshwater flagellates.  Gard. Bull. Straits Settlem. 3(19): 105-145.

Siver, P.A.  2003.  The Synurophyte algae.  In:  Wehr, J.D., and R.G. Sheath.  Freshwater algae of North America.  Academic Press.