Atagema intecta (Kelaart, 1858b) - formerly Trippa intecta

Atagema intecta

sub-classs Opisthobranchia > order Nudibranchia > sub-order Doridina > family Dorididae

Atagema intecta is dark brown with a rough texture. It usually has a characteristic lighter brown or cream line down its back but this may sometimes be absent.

Distribution =  widespread tropical Indo-west Pacific
Max size = 80mm

more info at Sea Slug Forum      more pics at nudipixel