Mastigoteuthis schmidti is a species of whip-lash squid.
| Mantle length | 46 mm | |
| Mantle width | 16 mm | |
| Fin length | 30 mm | |
| Fin width | 37 mm | |
| Arm I length | 18 mm | |
| Arm II length | 27 mm | |
| Arm III length | 28 mm | |
| Arm IV length | 56 mm | |
| Arm I sucker no. | 62 | |
| Arm II sucker no. | 80 | |
| Arm III sucker no. | 76-80 | |
| Arm IV sucker no. | 80-84 | |
| Tentacle length | 135 mm | |
| Club length | 86 mm |