What is "galesaurus"

Galesaurus was a prehistoric therapsid, incorrectly classified as a dinosaur by Sir Richard Owen in 1859. Notably, Galesaurus was mentioned in the first issue of Nature in 1869, where T. H. Huxley expressed confidence that it would eventually be shown to be a dinosaur. However, current opinion is that it was not a dinosaur and belongs to a mammal-like group called Cynodonts.