_:b666498511 "ISBN:978-0674639416" . _:b666498511 . _:b666498511 "Heterochronous homology that is produced by a retention in adults of a species of traits previously seen only in juveniles." . _:b666498511 . _:b666498511 . _:b666498511 . _:b666498511 . _:b666498511 . _:b666498511 .