Abstract
Handianus eurotiae and H. fartilis distinctly differ in the forewing venation and the male genitalia shape, but have strongly overlapping ranges, do not differ in ecological preferences, feed on the same host plant, Krascheninnikovia ceratoides, and produce almost identical male calling signals. They were never found in the same biotope, although the mechanism of such vicariation is not clear. According to Mayr’s biological species concept, such taxa are good species, but Paterson’s species recognition concept is inapplicable in this case. Similar examples in Orthoptera and Auchenorrhyncha are considered.
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