Most of the arguments which have convinced me that all the existing species of the same group are descended from a single progenitor, apply with equal force to the earliest known species.
Talde bereko espezie bizi guztiak gurasolehen bakarrarengandik etorriak diren komentzimendura eraman nauten arrazoirik gehienak, indar beraz aplikatzen zaizkie ezagutzen diren espezie zaharrenei ere.