Quantitative comparison of taxa and taxon concepts in the diatom genus Fragilariopsis: a case study on using slide scanning, multiexpert image annotation, and image analysis in taxonomy¹.

Heteropolarity index ( F 2,492 = 216.3, P < 10 −4 ), stria density ( F 2,492 = 62.66, P < 10 −13 ) and orientation ( F 2,492 = 95.67, P < 10 −5 ), rectangularity ( F 2,492 = 30.45, P < 10 −10 ), and three of five convexity indices tested (convexity by area, CDF, F 2,492 = 22.24, P < 10 −9 ; and PCAF, F 2,492 = 92.5, P < 10 −15 ), showed highly significant differences among all three taxa.

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