Richard Owen published the first modern scientific descriptions of sauropods in 1841, in a book and a paper naming "Cardiodon" and "Cetiosaurus". "Cardiodon" was known only from two unusual, heart-shaped teeth (from which it got its name), which could not be identified beyond the fact that they came from a previously unknown large reptile. "Cetiosaurus" was known from slightly better, but still scrappy remains. Owen thought at the time that "Cetiosaurus" was a giant marine reptile related to modern crocodiles, hence its name, which means "whale lizard". A year later, when Owen coined the name Dinosauria, he did not include "Cetiosaurus" and "Cardiodon" in that group.