Not only does the new plural form sound awkward, they are overlooking some small details.
Seems that Neo often forgets when they make a name change decision, they can't remain consistant.....
Examples:
Whoever changed the plural form of the pet managed to look up the old plural form in the database and changed the one item with "Pterii" in the name, namely the book "Legendary Pterii" for example, to "Legendary Pteris".
Of course, they forget that the book title shows the old name on the cover, which could be very confusing to people....
And they didn't change the old plural form in any of the item descriptions where it appeared before:
So, whoever was given this task, didn't even bother to make all the corrections needed. I can understand the book, some new artwork would need to be done. But the item descriptions? Even I, without the über database program at Neo to help me, needed to go no further than a quick check at Neoitems.net could see that these 5 items contained the old plural version and needed to be adressed:
Pteri Pop-Up Book
Forbidden Pteri Tales
Pteri Feather Book
Legendary Pterii
Pteri Battle Whistle
The old version was much better (my opinion), but I think if they decide to change something, all points of the site should reflect the new change....