The Invention of Somalia book showing Fission Fussion

Several folk tales talk about fission and fusion of subclans like these contraversies. What is so true about it?


Cali Geri(Dhulbhante)<-------------------------->Duduble(Hawiye)
Macalin Dhiblaawe(Abgaal) --------------------->Baaba Xasan (Shiiqal, Gendershe)
Macalin Dhiblaawe(Abgaal)<---------------------->Macalin Dhiblawe(Siwaqron)
Cawrmale(Warsangeli)<---------------------------Cawrmale(Gardhere,Samale)
Wagardhac(Mareexan)--------------------------->Qayad(Dhulbahante)
TagalaWaq(Ogaden)<------------------------------>Habarawal(Isaaq)
Leelkase(Xawaadle)<------------------------------Leelkase(Daarood)
Warsangeli (Harti Darod)<-------------------------Warsangeli(Harti, Abgal)
Sacad(Habargidir)---------------------------------Amuudaan(Ogaaden)
Cumar Dher(Habar Gidir)<------------------------>Mareexaan
Akisho------------------------------------------>Cabdalle Aden Dhulbahante and 7 Aw Hinjile
Kumurte Dir-------Tunni
and more
http://en.wikipedia.org/wiki/Cultural_assimilation
by the Invention of Somalia