Distribution and status poorly known owing to confusion with
hohenwartiana, it is likely that it will be found in dry open areas wherever the foodplant grows. Formerly regarded as a diminutive form of
E. hohenwartiana, and distinguishable from this species with certainty only on the basis of the larval foodplant (Common Knapweed in
E. hohenwartiana and Saw-wort in
E. parvulana). In Hampshire known from Leckford and Botley Wood. One From Totland in 2022 was the first for the island since a (possibly dubious) record in the 19th century, and the first for our area as a whole for over a decade. Wingspan 14-19 mm. On average smaller (although small specimens of
hohenwartiana also occur), and the forewings are more uniformly coloured - strongly contrasted specimens are more likely to be
hohenwartiana. No reliable distinguishing genitalic feature has been determined. Larva feeds within flowerheads of Saw-wort.