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The Eichwald's toad is very similar to Bufo verrucosissimus, but differs by a longer and more massive head, body proportions, skin texture, coloration, and numerous dark spots on the belly in males. In addition, B. eichwaldi has a head with an abrupt (not acutely rounded) snout tip, uniform dull brown dorsum, parotoid margin (contacting with tympanum) with black markings, and some larger rounded knobs on dorsum a little darker brown than the surface. The Eichwald's toad differs from B. verrucosissimus by a markedly lower genome size (13.22 - 13.36 vs. 13.53 - 14.09 pg per diploid nucleus), seven peculiar protein loci, values of indices Lc/L (2.74 - 2.81 vs. 3.37 - 4.67) and Lc/Ltc (0.94 - 0.98 vs. 0.59 - 0.88). B. eichwaldi differs from B. bufo by five peculiar protein loci, and values of indices Lc/L (2.74 - 2.81 vs. 3.07 - 4.51) and Lc/Ltc (0.94 - 0.98 vs. 0.61 - 0.86).