first of all a non described species should not have its own article it may however be mentioned in the genus article that there are a number of species without an assigned name in second place the website new zealand mollusca states that wainuia is a subgenus of rhytida this puts the articles about the genus and the species in wainuia into question furthermore the name wainiuia was introduced by powell in in the journal rec auckland inst mus and seems to be accepted by the nomenclator zoologicus all this makes it very confusing but should be mentioned in the articles