Rhinocyllus is a small genus of true weevil, with 4 species described.Ter-Minasyan ME. 1967. Weevils of the sub-family Cleoninae in the fauna of the USSR; tribe Lixini. New Delhi: Amerind Publishing Co The host plants of this genus are thistles in the subtribe Carduinae. Its sister group is Bangasternus.
The most well-known species is R. conicus which is a controversial agent of biological pest control which has been used against noxious thistles in the genera Carduus, Cirsium, Onopordum, and Silybum.
Species Rhinocyllus alpinus Gültekin, Diotti & Caldara, 2019 Rhinocyllus conicus (Frölich, 1792) Rhinocyllus oblongus Capiomont, 1873 Rhinocyllus turkestanicus Desbrochers des Loges, 1900
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