"This is Hypselodoris zephyra if one defines that species as having essentially straight lines (as opposed to diagonal lines in Hypselodoris nigrostriata) and lacks a yellow marginal band (as opposed to possessing a band in Hypselodoris nigrostriata). But, as I have commented on previously, I think these characters intergrade and they are the same species."
Comment from Richard Willan
This is Hypselodoris zephyra if one defines that species as having essentially straight lines (as opposed to diagonal lines in Hypselodoris nigrostriata) and lacks a yellow marginal band (as opposed to possessing a band in Hypselodoris nigrostriata). But, as I have commented on previously, I think these characters intergrade and they are the same species.