Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support

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
Published by: Wiley on behalf of American Microscopical Society
DOI: 10.2307/3226386
Stable URL: http://www.jstor.org/stable/3226386
Page Count: 11
  • Read Online (Free)
  • Cite this Item
If you need an accessible version of this item please contact JSTOR User Support
Observations on North American Gomphoneis (Bacillariophyceae). II. Descriptions and Ultrastructure of Two New Species
Preview not available

Abstract

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.

Page Thumbnails

  • Thumbnail: Page 
[141]
    [141]
  • Thumbnail: Page 
142
    142
  • Thumbnail: Page 
143
    143
  • Thumbnail: Page 
144
    144
  • Thumbnail: Page 
145
    145
  • Thumbnail: Page 
146
    146
  • Thumbnail: Page 
147
    147
  • Thumbnail: Page 
148
    148
  • Thumbnail: Page 
149
    149
  • Thumbnail: Page 
150
    150
  • Thumbnail: Page 
151
    151