What is "elpistostege"

Elpistostege is an extinct genus of tetrapod-like vertebrate that lived in the Late Devonian period (Late Givetian to Early Frasnian). Fossils of its skull and a part of its backbone have been found in rocks of the Escuminac Formation in Quebec, Canada. A complete specimen of the animal has since been found in the same formation. It has been proposed, by the palaeontologist Richard Cloutier at Université du Québec à Rimouski, that this species may dethrone its close relative Tiktaalik in the position of the most primitive stem-tetrapod, though phylogenetic analyses have shown them to be very close relatives.