(Enaliarctos_spp,(Pinnarctidion_spp,(Pteronarctos_sp,(Phocidae,(Otariidae,(Desmatophocidae,(Neotherium_mirum,(Imagotaria_spp,((Gomphotaria_pugnax,(Pontolis_magnus,Dusignathus_sp)),(Aivukus_cedrosensis,(Alachtherium_cretsii,Valenictus_chulavistensis,Odobenus_spp)))))))))));