Subgenus Phacidium Breddin, 1912

Type species: Phacidium euchlorum Breddin, 1912, by monotypy

Thyanta (Phacidium) acutangula Jensen-Haarup, 1928

= Thyanta mendozana Jensen-Haarup, 1928 (Syn. by Rider & Chapin 1991) = Thyanta crinita Ruckes, 1957 (Syn. by Rider & Chapin 1991) Thyanta (Phacidium) acutangula: Rider & Chapin, 1991 (Revision) Thyanta mendozana: Prado, 1991 (List, first Chilean record)

Thyanta acutangula: Prado, 2008 (List, mentioned but not listed)

Thyanta (Phacidium) juvenca Stål, 1862

= Pentatoma pilosum Reed, 1898 (Syn. by Kirkaldy 1909) Euschistus juvencus: Walker, 1867 (New combination) Thyanta (Phacidium) juvenca: Rider & Chapin, 1991 (Revision) Thyanta juvenca: Prado, 1991 (List)

Thyanta patruelis: Prado, 1991 (Misidentification rectified by Prado 2008) Thyanta juvenca: Prado, 2008 (List)