Assertion: plesiosaur's neck | /r/HasProperty | 19 cervical vertebrae
Facets:
Source sentences:
text: (The sauropod dinosaur Mamenchisaurus had the longest neck of any known animal at an estimated 13.1 m. (46 ft.) for the largest species (Mamenchisaurus sinocanadorum), but its neck was composed of "only" 19 cervical vertebrae.