If you're not picky about the stats on your rhyniognatha, you should definitely use this to tame your rhyniognatha, as it has a lot of health and weight capacity, and can run relatively fast with more endurance than a bronto, so you do not need to upgrade its stats very much after taming it. In addition, they're almost invisible to most swamp creatures (not including the rhyniognatha) so you can tame the rhyniognatha without much interference from the other creatures. They also spawn in the same place as the rhyniognatha so if ur REALLY not picky, you can tame the rhyniognatha on the spot without bringing a lot of its cravings with you. Hope this helps! :)

-- Comet7892