Classification of Benedetto 2015
G. †Sivorthis Jaanusson and Bassett 1993
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†Sivorthis precordillerana Benedetto 2015
Superfm. †Plectambonitoidea Jones 1928
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Fm. †Taffidae Schuchert and Cooper 1931
Invalid names: Tafflidae Schuchert and Cooper 1931 [empty]
Fm. †Taffiidae Schuchert and Cooper 1931
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Superfm. †Plectorthoidea Schuchert and Le Vene 1929
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Fm. †Chilcorthidae Benedetto 2015
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G. †Chilcorthis Benedetto 2015
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†Chilcorthis huarpe Benedetto 2015
†Chilcorthis mucronata Williams and Curry 1985