For lo, it did come upon this day that the ICZN did look upon electronic-only publication, and say that it was good. Provided that it met the following requirements:
(1) the published work must be registered with ZooBank prior to publication, with provision in the ZooBank record of a permanent archive in which the the published work will be held,
(2) the published work must include evidence of registration, such as the ZooBank registration number, and
(3) the published work must be associated with either an ISSN or ISBN number, so it must be a formal 'book' or 'journal'.