Olson suggests two possible origins for B. borrasi : either it diverged from B. urubitinga in Cuba .
B. urubitinga evolved on the mainland and eventually became extinct there , leaving a relict population in Cuba .
Olson suggests two possible origins for B. borrasi : either it diverged from B. urubitinga in Cuba , or it evolved on the mainland and eventually became extinct there , leaving a relict population in Cuba .