Answer | Crossword Clue |
---|---|
synapsids | A fossil reptile of a Permian and Triassic group, the members of which show increasingly mammalian characteristics and include the ancestors of mammals |
synapsid | A fossil reptile of a Permian and Triassic group, the members of which show increasingly mammalian characteristics and include the ancestors of mammals |
therapsid | An extinct reptile of a Permian and Triassic order, the members of which are related to the ancestors of mammals |
therapsids | An extinct reptile of a Permian and Triassic order, the members of which are related to the ancestors of mammals |