These two species (A and I), were also supposed to be very common and widely diffused species, so that they must originally have had some advantage over most of the other species of the genus.
(A) eta (I) espezie biok espezie oso arrunt eta zabal hedatuak zirela ere suposatzen zen, halatan, non jatorriz abantailaren bat izan behar zuten genero bereko espezierik gehienen aldean.