A genus of beetles, particularly blister beetles, known for producing toxic compounds used in traditional medicine and defense mechanisms.
From Greek 'epi' (upon) + Latin 'cautus' (cautious/careful), though some sources suggest a connection to 'causis' (burning). Named in the 19th century for their caustic properties.
These beetles produce canthardin, a toxic chemical so powerful it was historically used in 'Spanish fly'—making beetles one of history's most dangerous (and misused) sources of chemical weapons.
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