• Hylesia (Hylesia) santex is a member of the clade Hylesia umbrata:

• Species	Author
  Hylesia (Hylesia) carbajalex	Brechlin & Meister, 2016
  Hylesia (Hylesia) jongerlingi	Brechlin & van Schayck, 2016
  Hylesia (Hylesia) palcazua	Schaus, 1911
  Hylesia (Hylesia) paravalvex	Brechlin & van Schayck, 2016
  Hylesia (Hylesia) santex	Brechlin & Meister, 2016
  Hylesia (Hylesia) terrosex	Dognin, 1916
  Hylesia (Hylesia) umbrata	(Schaus, 1911)
  Hylesia (Hylesia) valvex	Dyar, 1913

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