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Observations on North American Gomphoneis (Bacillariophyceae). II. Descriptions and Ultrastructure of Two New Species
John P. Kociolek and E. F. Stoermer
Transactions of the American Microscopical Society
Vol. 105, No. 2 (Apr., 1986), pp. 141-151
Stable URL: http://www.jstor.org/stable/3226386
Page Count: 11
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Two new species of the diatom genus Gomphoneis are described from Oregon (U.S.A.). Light and scanning electron microscopic observations of G. trullata n. sp. show that this diatom has striae with two rows of indistinct, slit-like puncta and an axial plate located circa ½-⅔ the way between the axial area and the valve margin. As in other species of Gomphoneis, the axial plate is responsible for the image of longitudinal lines characteristic of the genus. Gomphoneis trullata is distinguished from previously described species by its distinctively shaped valves, which are widest between the central area and the footpole, and by the position of the longitudinal lines. The second species, G. linearis n. sp., is a rare form known only from the Metolius River. It is distinguished by its linear valve outline, submarginal longitudinal lines, and distinct doubly-punctate striae.
Transactions of the American Microscopical Society © 1986 American Microscopical Society