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QUANTITATIVE ANALYSIS OF SHAPE VARIATION IN TYPE AND MODERN POPULATIONS OF MERIDION (BACILLARIOPHYCEAE)
Article first published online: 21 DEC 2001
Journal of Phycology
Volume 37, Issue 1, pages 175–183, February 2001
How to Cite
Rhode, K. M., Pappas, J. L. and Stoermer, E. F. (2001), QUANTITATIVE ANALYSIS OF SHAPE VARIATION IN TYPE AND MODERN POPULATIONS OF MERIDION (BACILLARIOPHYCEAE). Journal of Phycology, 37: 175–183. doi: 10.1046/j.1529-8817.2001.037001175.x
- Issue published online: 21 DEC 2001
- Article first published online: 21 DEC 2001
- 1 Received 28 June 1999. Accepted 13 November 2000.
- Bacillariophyta or Bacillariophyceae;
- Legendre polynomials;
- shape analysis;
Subtle differences in valve morphology can indicate sexually isolated populations in diatoms (Bacillariophyceae). Shape descriptors, like Legendre coefficients, have been used to quantify differences in valve outline so that morphologically distinct groups can be recognized. Legendre coefficients were used as shape descriptors to quantify differences in valve outline among five populations in the genus Meridion Ag. Two novel populations of Meridion from North America, a North American population of M. constrictum Ralfs, type material for M. circulare (Greve.) Ag., and type material of M. constrictum were included in this analysis. Results of a principle components analysis and discriminate analyses on the shape descriptors of all five populations support the hypotheses that the two novel North American populations are undescribed taxa within Meridion and that the North American M. constrictum can be considered Meridion constrictum sensu stricto. A new taxon, Meridion hohii Rhode, is described. There appears to be greater diversity within the genus Meridion than is currently recognized.