Heterogaster Schilling, 1829: 37, 84. Type species by subsequent designation (Curtis, 1836: text to pl. 597): Cimex urticae Fabricius, 1775. Placed on the Official List of Generic Names in Zoology (Opinion 679, 1963).
Phygas Fieber, 1837: 348 (junior homonym of Phygas Treitschke, 1833, Lepidoptera). Unnecessary new name for Heterogaster Schilling, 1829.
Phygadicus Fieber, 1851c: 37. New name for Phygas Fieber, 1837.