くろあたまうみへびでわありません
黒頭海蛇ではありません
kuroatamaumihebidewārimasen

Noun
Desu Copula
Negation Auxiliary

The polite negative form of くろがしらうみへび

1. Not a black-headed sea snake.

Negative
Polite
Formal Register
Usually Written in Kana