Table 1.
Incomplete list of cephalopod species of megafauna size, i.e. With body size exceeding one meter26. Note that there are no nautilid species exceeding a conch diameter of 800 mm. Dimensions are conch lengths in orthocones, conch diameters in ammonoids, and mantle lengths in neocoleoids.
| Group | Age | Species | Dimensions mm | Volume l |
|---|---|---|---|---|
| Orthocones | Ordovician | Proterovaginoceras incognitum | 1000 | 0.8 |
| Orthocones | Ordovician | Ormoceras giganteum MB.C.11,940 | 1710 | 2.72 |
| Orthocones | Ordovician | Ormoceras TUG 1308-1 | 1720 | 2.66 |
| Orthocones | Ordovician | Endoceras giganteum | 4730 | 89.04 |
| Orthocones | Ordovician | Lambeoceras lambei | 1405 | |
| Orthocones | Silurian | Geisonoceras crebristriatum | 1911.41 | 8.9 |
| Orthocones | Silurian | Orthoceras gregarium | 1390 | 5.13 |
| Orthocones | Silurian | Temperoceras aequinudum | 1333 | 9.21 |
| Orthocones | Devonian | Deiroceras hollardi | 2001.83 | 48.91 |
| Orthocones | Devonian | Zeravshanoceras priscum | 1299.3 | 1.57 |
| Orthocones | Devonian | Basiloceras goliath | 1200 | 12 |
| Orthocones | Devonian | Plagiostomoceras sp. | 1100 | 0.029 |
| Orthocones | Carboniferous | Rayonnoceras solidiforme | 2800 | 62.51 |
| Orthocones | Carboniferous | Actinoceras vaughanianum | 1197.56 | 8.71 |
| Ammonoids | Devonian | Costaclymenia sp. | 1000 | 138.39 |
| Ammonoids | Triassic | Pinacoceras metternichi | 1040 | 154.21 |
| Ammonoids | Jurassic | Lytoceras | 1500 | 421.34 |
| Ammonoids | Jurassic | Lobolytoceras | 1540 | 452.92 |
| Ammonoids | Jurassic | Lytoceras taharoaense | 1500 | 421.34 |
| Ammonoids | Jurassic | Lytoceras | 1925 | 835.87 |
| Ammonoids | Jurassic | Corbinites occidentalis | 1320 | 296.61 |
| Ammonoids | Cretaceous | Emericiceras thiollierei | ?1000 | |
| Ammonoids | Cretaceous | Parapuzosia seppenradensis | 2050 | 934.75 |
| Ammonoids | Cretaceous | Diplomoceras maximum | 1025 | 148.09 |
| Ammonoids | Cretaceous | Baculites grandis | ?1500 | ?10 |
| Neocoleoids | Jurassic | Megateuthis elliptica | 1360 | 31.7 |
| Neocoleoids | Jurassic | Megateuthis suevica | 1000 | 36.61 |
| Neocoleoids | Jurassic | Leptoteuthis gigas | 1300 | 28.79 |
| Neocoleoids | Cretaceous | Eromangateuthis soniae | 1200 | 24.54 |
| Neocoleoids | Cretaceous | Enchoteuthis melanae | 2000 | 88.25 |
| Neocoleoids | Recent | Mesonychoteuthis hamiltoni | 3000 | 495 |
| Neocoleoids | Recent | Onykia robusta | 2000 | 41.73 |
| Neocoleoids | Recent | Architeuthis dux | 2690 | 275 |