Classification of the subgenus Tytthonyx (Tytthonyx)
Subg. Tytthonyx (Tytthonyx) LeConte 1851
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†Tytthonyx (Tytthonyx) geiseri Poinar and Fanti 2016
†Tytthonyx (Tytthonyx) milleri Ivie et al. 2022
†Tytthonyx (Tytthonyx) stadili Fanti and Damgaard 2019