“Your question number two bears no relevance to anything. We have not found it because we don’t know of any creature which perfectly fits the simanim. That does not mean that there is none.”
See Rav Tavger’s Maamar Hatcheiles where he writes that we have a list of all snails on the coast of E”Y and Sinai (I checked it, it’s about 900 species) and the proof that we didn’t miss any is that nothing new is ever found.
L’fi your tzad that Chazal gave stark and clear Simanim in order to find it, it’s impossible it wasn’t found.
Unless you’ll say it’s ???? ??? ???? ????, then you’ll have to answer about all the ??????? who learn otherwise, and then you can’t say Chazal was saying how to find it if it can’t be found.