Triachus is a genus of case-bearing leaf beetles in the family Chrysomelidae. There are about five described species in Triachus.
Species These five species belong to the genus Triachus: Triachus atomus (Suffrian, 1852) Triachus cerinus J. L. LeConte, 1880 Triachus peninsularis Schaeffer Triachus postremus J. L. LeConte, 1880 Triachus vacuus J. L. LeConte, 1880
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