Miyamoto (1972) transferred Coptosoma capitatum to Tiarocoris, but Josifov & Kerzhner (1978) returned it to Coptosoma. Kerzhner & Jansson (1985) distinguished in the type material, originally labelled as Coptosoma biguttula Motschulsky, 1860, the paralectotypes of Coptosoma capitatum. Both the species, Coptosoma biguttulum and Coptosoma capitatum, are accepted as valid (Kerzhner & Jansson, 1985).
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