| Rhachitheciaceae | ! |
Hypnodontopsis apiculata
| Z. Iwats. & Nog. | Bryologist 60: 304, f. 7–29 | 1957 |
| Rhachitheciaceae | |
Hypnodontopsis casparyi
| (R. Klebs) J.-P. Frahm | Bryologist 108: 231 | 2005 |
| Rhachitheciaceae | |
Hypnodontopsis conferta
| (Göpp. & Berendt) J.-P. Frahm | Trop. Bryol. 20: 80 | 2001 |
| Rhachitheciaceae | |
Hypnodontopsis fossilis
| J.-P. Frahm | Lindbergia 25: 36. f. 9 | 2000 |
| Rhachitheciaceae | ** |
Hypnodontopsis fossili-sterilis
| Estrada-Ruiz & Riquelme | Ameghiniana 54(1): 126, 1–2 | 2017 |
| Rhachitheciaceae | |
Hypnodontopsis lingulata
| J.-P. Frahm | Bryologist 108: 232. f. 12 | 2005 |
| Rhachitheciaceae | ! |
Hypnodontopsis mexicana
| (Thér.) H. Rob. | Bryologist 67: 449 | 1964 |
| Rhachitheciaceae | |
Hypnodontopsis pilifera
| J.-P. Frahm | Rev. Palaeobot. Palynol. 129: 86 | 2004 |
| Rhachitheciaceae | ! |
Hypnodontopsis spathulata
| H. Akiyama & At. Tanaka | Bryol. Res. 8: 132, f. 1–22 | 2002 |