Yes, for searching, and also for general identification purposes. Many different users may look at the observation, and they won’t all have the same levels of experience/ knowledge as I do. However, this can just as easily be achieved with observation fields or brief comments.
My own preference would be to remove Teneral, because I think it is far too specialized for an annotation option. But if it must be retained, I strongly dislike having Teneral and Adult, but not Immature. Without the latter option, I feel it invites misuse of Teneral as a synonym of Immature.