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Variation in palmar interdigital ridge-counts among the 20 Dhangar castes of Maharashtra, India.

Bilateral palmar prints of 2927 males of 20 endogamous Dhangar castes of Maharashtra, India, were studied for the distributions of a-b, b-c and c-d interdigital ridge-counts. The ridge-counts have been utilized for examining the inter-population affinities among the Dhangar castes. The distribution of a-b ridge-counts is symmetrical and normal in Dhangar castes. The distributions of b-c and c-d ridge-counts on both palms also show (nearly) normal distribution, but with a tendency of negative skewness and platykurtosis in c-d ridge-count. Equality of means and standard deviations depict significant heterogeneity. The decreasing order of magnitude of means of interdigital ridge-counts is a-b > c-d > b-c among all the Dhangar castes. Intercaste comparisons reveal a great deal of variations in all ridge-counts. The pattern of relationship between the Dhangar castes based on the three ridge-counts is in agreement with the expected patterns of affinities based on the known ethno-historical evidence. The significant finding of the study is that the palmar interdigital ridge-counts follow normal distribution and that they are useful in studying inter-population affinities.