Plesiosaurus planus OWEN 1864 (nomen dubium)
Genus
Specimens
| The Natural History Museum, London | |
| BMNH not known | Series of vertebra centra |
| Owen 1857 TAB II 1-2 | posterior cervical vertebra |
| Owen 1857 TAB II 3-5 | posterior cervical vertebra |
| Owen 1857 TAB II 6-9 | posterior cervical vertebra |
| Owen 1857 TAB III 1-4 | posterior cervical vertebra |
| Owen 1857 TAB III 5-6 | posterior cervical vertebra |
| Owen 1857 TAB III 7-9 | posterior cervical vertebra |