localhost in zonefile?

Gentlebeings -
        Forgive the intrusion, but I have a DNS question that I think you should
be able to provide a definitive answer on (something I can't get from other
sources). The question is this: should I have an entry such as

localhost       A       127.0.0.1

in a zonefile? This seems to me somewhat silly, but I have seen examples in
various places showing it. Also, I've been told that HP-UX v9 breaks if it isn't
in.

I'm not on the discussion list, so I'd appreciate answers to this address.
Thanking you all in advance ...

 - Arthur Green
   University College Dublin Computing Services
   Tel: +353 1 706 2456  Fax: + 353 1 283 7077  E-mail: arthur at midir.ucd.ie