monophyletic
Concise Oxford English Dictionary © 2008 Oxford University Press:
monophyletic /ˌmɒnə(ʊ)fʌɪˈlɛtɪk/
▶adjective Biology (of a group of organisms) descended from a common evolutionary ancestor or ancestral group, especially one not shared with any other group.
'monophyletic' also found in these Oxford entries:

