くろあたまうみへびであれば
黒頭海蛇であれば
kuroatamaumihebideareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of くろがしらうみへび

1. If it were a black-headed sea snake; If black-headed sea snakes existed

Ba Conditional
Usually Written in Kana