because Marsh initially believed that some vertebrae erroneously resembled marine reptiles like mosasaurs

well-developed supraorbital horns

which include bones from various parts of the skeleton such as vertebrae

Kentrosaurus (K

Hatzegopteryx thambema Variant:Hand-painted because Marsh initially believed thatHatzegopteryx thambema was one of the largest known pterosaurs and a dominant predator in the Late Cretaceous island ecosystems of Europe. It lived approximately 72 to 66 million years ago on Haeg Island, an archipelago in the ancient Tethys Sea, now part of the Transylvania region of Romania. This animal belonged to the azhdarchid group, giant pterosaurs characterized by elongated skulls, extremely long necks, and large wingspans. Size estimates