We may suppose that only one (F) of the two species (E and F) which were least closely related to the other nine original species, has transmitted descendants to this late stage of descent.
Suposa dezakegu jatorrizko bederatzi espezieengandik urrunen zeuden espezie bietako (E eta F) batek bakarrik, (F)-k, eman dituela ondorengoak azken belaunaldira arte.