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The Frustular Morphology of Amphora thumensis (Mayer) A.Cl. from Northern Lake Michigan and Consideration of Its Systematic Position

John C. Kingston, Rex L. Lowe and Eugene F. Stoermer
Transactions of the American Microscopical Society
Vol. 99, No. 3 (Jul., 1980), pp. 276-283
Published by: Wiley on behalf of American Microscopical Society
DOI: 10.2307/3226003
Stable URL: http://www.jstor.org/stable/3226003
Page Count: 8
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The Frustular Morphology of Amphora thumensis (Mayer) A.Cl. from Northern Lake Michigan and Consideration of Its Systematic Position
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Abstract

Specimens of a small diatom from Grand Traverse Bay, Lake Michigan, were studied with light and scanning electron microscopy. They were assigned to the genus Amphora Ehr. ex Kütz., although previous investigators had most often treated the diatom as Cymbella parvula Krasske or Cymbella thumensis (Mayer) Hust. Characteristics influencing the genus assignment include differential mantle development, multiple intercalary bands, and raphe structure. Pertinent literature is reviewed. Comparisons are made to Amphora coffeiformis (Ag.) Kütz. isotypes, and arguments for use of the name Amphora thumensis (Mayer) A.Cl. are given.

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