TYPE SPECIES:
• A. altus Cope, 1877 [nomen dubium?] "tall double cavities"
  OTHER SPECIES:
• A. fragillimus Cope, 1878 [nomen dubium] "very fragile double cavities"
  
  MISASSIGNED SPECIES:
• A. latus Cope, 1877 "broad double cavities" == Camarasaurus supremus

Animalia
Vertebrata
Tetrapoda
Sauropsida
Archosauromorpha
Ornithodira
Dinosauria
Sauropodomorpha
Sauropoda
Diplodocimorpha

• A. fragillimus: ?45 m

• A. fragillimus: ?100 tonnes to ?150 tonnes

Amphicoelias fragillimus was named for an enormous, crumbling vertebra which has since been lost (if it ever existed). Only a drawing remains, which claims that the vertebra was 2.4 m tall. It may have represented an enormous individual of A. altus