sentences:  In much of Western Europe the "Kobeltia" species most likely to be confused is "A. hortensis"; mixed populations often occur.Authorities differ in their advice on how reliably the two species can be separated using external characters when alive.Useful indications are that "A. distinctus" has dark tentacles without the red or violet tinge typical of "A. hortensis", the general appearance of its back is yellower or browner than in "A. hortensis", the row of tubercles directly above the sole is not as white as is typical of "A. hortensis", and (least reliably) the lateral bands tend to be lower, running through the pneumostome rather than above.