You are very familiar with Spanish bird names. Paraulata from Venezuela sounds a little like native one and appears to be the best choice.
I was joking in the previous post, a list of reccomended common names is a little helpful, at least due to huge number of species, very frequently similar to each other and having very similar names, or not called at all, but they don't need to be "binominal" like latin names.
Such official names help to communicate without misunderstandings, because as you said people rather use and memorize common names, not scientific ones, and common names are also important.
And the best names would be those taken from native languages, not from someone's head. I mean most of all Genera without English names, not found anywhere else (not like one more Magpie or Thrush, except very atypical ones). For example new Genera somewhere from South America, like Venezuelan jungle. Why to create new artificial English names for them ? (and in other languages) Ask natives how they are called.
Very difficult situation in my opinion is with names of amphibians and reptiles:
http://www.ssarherps.org/pages/HerpCommNames.php
http://ebeltz.net/herps/etymain.html
They look sometimes a little like puzzle assembled by someone from words, very frequently from more then two elements (Atlantic Coast Slimy Salamander, Comal Blind Salamander, Allegheny Mountain Dusky Salamander, Western Bird-voiced Treefrog etc), only to create unique name for one more species distiguished from others on the basis of DNA analysis ... They also change, if you compare these two pages carefully.
You can find analogical official lists of bird names in other countries, here is Polish one:
http://www.eko.uj.edu.pl/listaptakow/rzedy.html
but many of them sound artificially, are not taken or are not direct translations from languages of countries, where they occur, but probably generated in someone's head, moreover some of names existing previously before creation of that list were replaced by something a little strange ...
By the way. My feeling is that sometimes changes in taxonomy includig splits of species are not reasonable at all and they are only result of competition between scientists who want very much to create someting new, to be in focus, and generate something curiosal sometimes ... Like merging reptiles and birds into one taxon ... Do they get pay or receive medal for each new idea or what ?
Regarding those coots, maybe really both of them should be called Mooren or eventually both of them Gallinule, because they not only belong to the same Genus, but are almost identical. And because these species were called in both continents the same way, local or native (for example Lakota) common names probably don't exist, so completely new name is needed. "Laughing" Moorhen proposed by Marshall Iliff sounds well. Common means nothing. "American" would be good too, because this is hallmark of this species.
Someone should also create English names of
families and
orders, because in many cases they don't exist at all ! And latin ones sound for people almost like random sequences of characters. English names are very appreciated in this case.