Type species: Dimorphostylus tetrastichus Voigt, 1925
This genus includes the species:
| Dimorphostylus cylindracea | (Ulrich & Bassler, 1907) | Paleogene Paleocene Thanetian | USA New Jersey | WoRMS 1823676 |
| Dimorphostylus tetrastichus | Voigt, 1925 | Cretaceous | Germany | WoRMS 1401513 |