phylogeny and possible relations of the characteristics which other more present snakes may share. The articulate snake vertebrate fossils were found and studied in terms of the trunks and vertebral morphological variation has allowed for the deduction of that UNC-CIP 1 can be identified in the Dinilysia genus. Additionally, the ongoing debate of whether snakes evolved on land or in the ocean; certain pieces of evidence point towards oceanic origin based on possible close relationships between snakes and mosasaurs. However, further evidence shows that terrestrial origin is quite possible because of the structure similarities between the inner ear of the Dinilysia and similar burrowing squamate snakes. Based on both the evolutionary and morphological features and similarities that D. patagonica possess, evidence can be drawn from the features in order to predict the general location of origin. Furthermore, the anatomy of fossilized skull fragments of D. patagonica suggests that there are numerous plesiomorphic and apomorphic characters in comparison to respective extinct snakes, and present day snakes as well. These can be loosely attributed to the adaptive morphological characteristics present in the effects of terrestrial adaptation, in comparison to that of aquatic adaptation which would result in many more water adaptive features, especially in that of the skull and the spine as to ensure water to be a livable environment for the D. patagonica. There are numerous resources for evidence of the morphological characteristics of D. patagonica, including a full medium sized skull of D. patagonica which also has the posterior brain, the vessels, the cranial nerves, the inner ear, as well as the semicircular canals of the skull structure: which have all been naturally endocranially cast, which has been recorded as the first natural endocranial casting of an extinct snake species. The information that has been studied and presented from this fossil has brought light to new information regarding the morphological importance of different characteristics within the semicircular canals, as well as the functionality of the olfactory bulb. Through the study of the lightly differentiated castings of the portions of the brain, it was assumed that D. patagonica was a terrestrial reptile due to the level of development of the olfactory sensory bulb within the cast brain. Therefore, if it had to be deduced whether snakes, and more specifically, Dinilysia patagonica adapted terrestrially or aquatically, the presented studies all suggest in one form or another that the features and adaptations present