| Genus | Species | Authority | Distribution | References |
| Simognathus | areolatus | Newell 1984 | Continental | Newell, 1984 |
| Simognathus | hulingsi | Newell 1984 | Continental | Newell, 1984 |
| Simognathus | magellanicus | Newell 1984 | Continental | Newell, 1984 |
| Simognathus | pectinatus | Newell 1984 | Continental | Newell, 1984 |
| Simognathus | obtusus | Newell 1971 | Continental | Newell, 1984 |
| Simognathus | subobtusus | Newell 1984 | Pacific Islands | Newell, 1984 |
References
Newell, I.M. (1984) Antarctic Halacaroidea. Biology of the Antarctic Seas XV. Anatarctic Research Series, Volume 40. American Geophysical Union, Washington D.C. USA. pp 284.