Let J be an almost complex Structure in the projective space $\mathbb{C} P^2$. According to Duval a J-line in the almost complex projective space $\mathbb{C} P^2,$ is the almost complex analogue of a projective line, hence it is a J-holomorphic curve plunged in ($\mathbb{C} P^2, J$), diffeomorphic to $\mathbb{C} P^1$ and of degree 1 in homology.
What is the analogue definition of a J-hyperplane in the almost complex projective space $(\mathbb{C} P^n, J)$? ~~where J be an almost complex Structure on $\mathbb{C} P^n$.