Classification of the subgenus Spiriferina (Mentzelia)
Subg. †Spiriferina (Mentzelia) Quenstedt 1871
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†Spiriferina (Mentzelia) bittneri Salomon 1895
†Spiriferina (Mentzelia) fraasi Bittner 1890
†Spiriferina (Mentzelia) mentzeli De Toni 1912
†Spiriferina (Mentzelia) microglossa Bittner 1902
†Spiriferina (Mentzelia) spitiensis Stoliczka 1865