Some New Analytic and Graphic Approaches to Numerical Taxonomy, with an Example from the Dermanyssidae (Acari)

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Abstract
A numerical taxonomic study of the acarine family Dermanyssidae comprised 17 OTUs, including the females of all described species of the genus Dermanyssus and one representative of the genus Liponyssoides (=Allodermanyssus). OTU distances and correlations were computed on the basis of 135 characters taken from all areas of the body, and these similarity values were structured by means of graphic analysis, cluster analysis, contour diagrams and centroid factor analysis. A technique developed for the identification of OTUs poorly placed in a phenogram also provided a method supplementary to the cophenetic correlation coefficient for the assessment of phenogram distortions. Several taxonomic changes are proposed as a result of the study.

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