Iowa Prominent (Heterocampa simulans)
This species was described in 1924 based on a single male specimen; it is, however, thought to be a misidentified specimen of another species, the Colorado Prominent (Heterocampa rufinans (Dyar)).
The sole specimen needs a revision, if it turns out to represent indeed a distinct species (which is rather unlikely), then it is most likely extinct.
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edited: 14.08.2022