Except they wouldn’t try to prove its existence, rather, it’s persistence. A fairly simple difference.
Yet cryptozoology is defined as the 'pseudoscience and subculture that aims to prove the
existence of entities from the folklore record'.
Except he is not a ‘professional’ cryptozoologist: the quote you posted literally said that. I could also quote many more actual cryptozoologists who think the opposite, but that would take some time and I am quite busy, so I will post them later.
He is a professional in the field of finding animals that are thought to be extinct though, as I said, which makes him more relevant to the conversation at hand than the 'actual cryptozoologists' you cite given that is what we are talking about. You suggest I claimed he was a cryptozoologist, I never did, I claimed the opposite and so does he.
Either way, it is clear that a cryptozoologist asked if the thylacine is a cryptid would say yes and a person like Galante would say no, given the obvious incentives to do so.
Not directly related, but you should remember that photographs are easily faked, and not proof in and of themselves.
More pedantry - of course I know this, I didn't want to mention it for fear of making my argument clunky and sentences twice the necessary length. Furthermore they didn't have photo editing softwares in the late 19th century anyway so this is utterly irrelevant.
No.
For example, those species present in Africa during the evolution of Homo sapiens have never been cryptids, unless they have since gone extinct and are yet looked for by cryptozoologists, but I am unaware of any such examples, and you do not consider extinct species cryptids.
African animals like rhinos or cheetahs were cryptids to the Romans for example, just as jaguars or black bears were cryptids to early European settlers in America. Virtually every single animal out there has been a cryptid at some point to someone. You have to remember that for virtually the entirety of man's existence up to a couple of hundred years ago there was little to no communication across long distances, let alone across continents. Rumours of horned animals in Africa and pouched jumping mammals in Australia reached Europe in trickles and in stories often distorted by being passed on via hearsay. These animals were undeniably cryptids in Europe at the time. Just think of Durer's rhinoceros for an example.
In addition, I doubt ‘tales’ of any animals from the Americas, let alone the very existence of such continents, reached the old-world in prehistoric times prompting them to look for them, which, unless I am misunderstanding you, is essentially what you define as a cryptid. When the time the America’s were finally colonised by people and these species seen for the first time, I don’t think many people doubted their existence, and even if they did, it would be a minority of these species.
Obviously not, since no-one travelled from the Americas to the Old World in prehistoric times?
When you say colonised by people, do you mean the Native Americans or the Europeans? If the former, then I am confused by your statement. Imagine you are a settler in the Americas, having just entered Alaska. You are by yourself on a hunting expedition and see a black bear. You run back to the camp and report your sighting of a massive black animal with immense claws and big teeth. That animal is a cryptid, because it is exactly the same situation as for example the Nandi bear from their perspective - an unknown animal only spotted a couple of times. I don't really understand your last sentence, but clearly ever new species they see would be described and passed on by hearsay, each time slightly distorting it, so once again, a cryptid.
Similarly, it would be near impossible for there to have been claims of certain fossil animals before the first scientifically described specimens are unearthed and photographed, especially fragmentary but diagnostic ones.
Unless you think a creature can be a cryptid before anyone has even claimed it’s existence?
Don't understand what you are saying here either but dinosaurs upon being discovered were of course viewed as cryptids, along with any fossils. The vast majority of Europe were religious and disregarded the claims of immense creatures once roaming the Earth before man because of the scriptures. So of course dinosaurs were cryptids for many years until the tide of public opinion began to change and they were generally accepted are having existed.