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Thank you very much for your reply!

The specimen was collected by sweeping low vegetation, and the only Centaurea species I recall observing on site was Centaurea calcitrapa. That said, in the absence of formal confirmation that other potential host plants were not present, I believe it is safer to refer to this as Chaetorellia sp.

Regarding host plants, I’ve compiled the following list:

For Chaetorellia jaceae: Centaurea alba, Centaurea debeauxii, Centaurea jacea, Centaurea margaritacea, Centaurea nigra, and Centaurea scabiosa

For Chaetorellia acrolophi: Centaurea maculosa, Centaurea calcitrapa, Centaurea diffusa, Centaurea leucophaea, Centaurea vallesiaca, Centaurea virgata, Centaurea cariensis subsp. longipapposa, Centaurea hanrii subsp. spinabadia, Centaurea pectinata, Centaurea stoebe

Does this list look correct and complete to you?

Thanks again for your help!