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In order to clarify the distribution pattern of Cobitis populations along the southern Caspian Sea basin, 97 specimens collected from five localities were morphologically examined. Univariate analysis of variance showed significant differences (P<0.05) among the means of the five groups for 28 out of 33 standardized morphometric measurements and 7 out of 10 meristic numerations. In linear discriminant function analysis (DFA), for morphometric characteristic the overall assignment of individuals into their original groups was high (84.9%), indicating that these populations are highly divergent. The proportion of individuals correctly classified into their original groups were 77.4%, 77.3%, 100%, 100% and 89.5% for Cobitis sp. (Gisum River), Cobitis keyvani (Sefidroud River), C. keyvani (Tonekabon River), Cobitis faridpaki (Siahroud River) and C. keyvani (Talar River), respectively. Clustering based on Euclidean distances among these groups of centroids using an UPGMA and also principal component analysis’ (PCA) results indicated that the southeastern Caspian spined loach populations are C. faridpaki and the south central ones are C. keyvani and an unknown population, Cobitis sp. is distinguished from southwestern of the basin. Also Tonekabon and Sefidroud rivers are found as two new habitats for C. keyvani in the

DISTRIBUTION AND STATUS OF SPINED LOACH POPULATIONS (Actinopetrigii: Cobitidae) ALONG THE SOUTHERN CASPIAN SEA BASIN