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Ultrastructure of Cymbella sinuata and its Allies (Bacillariophyceae), and Their Transfer to Reimeria, Gen. Nov.
John P. Kociolek and Eugene F. Stoermer
Vol. 12, No. 4 (Oct. - Dec., 1987), pp. 451-459
Published by: American Society of Plant Taxonomists
Stable URL: http://www.jstor.org/stable/2418882
Page Count: 9
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Light and scanning electron microscopy are employed to describe the ultrastructure of Cymbella sinuata and allied taxa. Observations show the C. sinuata group shares features of valve symmetry and number of apical pore fields with members of the genus Cymbella s. str., while having raphe, striae, and stigmal features similar to Gomphonema species. The features shared between the C. sinuata group and Cymbella appear to be symplesiomorphies, while the group lacks apomorphic features characteristic of Gomphonema. These observations, in addition to a unique construction of the apical pore fields in the C. sinuata group, suggest its placement in a new genus, Reimeria. Features of the new genus are described and its systematic position discussed. A new fossil species, R. lacus-idahoensis is proposed.
Systematic Botany © 1987 American Society of Plant Taxonomists