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These openings became favourable sites for the fibrous gypsum to develop perpendicular to the wall of factures as well as fault plane.It is a member of Notoungulata, one of several now extinct orders of hoofed mammals indigenous to South America.It was among the largest and last members of its order, and was probably the most common large-hoofed South American mammal of its time.Analysis of collagen sequences obtained from Toxodon as well as from Macrauchenia found that South America's native notoungulates and litopterns form a sister group to perissodactyls, making them true ungulates.Because of the position of its nasal openings, it is believed that Toxodon had a well-developed snout.To understand more about cookies, tags, and tracking, see our Privacy Statement1 Issue per year IMPACT FACTOR increased in 2015: 2.038Rank 12 out of 54 in category Paleontology and 70 out of 184 in Geosciences, Multidisciplinary in the 2015 Thomson Reuters Journal Citation Report/Science Edition SCImago Journal Rank (SJR) 2015: 1.027Source Normalized Impact per Paper (SNIP) 2015: 0.880Impact per Publication (IPP) 2015: 1.600 *Prices in US$ apply to orders placed in the Americas only.Prices in GBP apply to orders placed in Great Britain only.The ongoing compressive stresses active on the region have finally resulted in further uplift of the footwall back limb to its present topography. cookies, tags, and tracking settings to store information that help give you the very best browsing experience.The vertebrae were equipped with high apophyses, which most likely supported the massive weight and muscles as well as its powerful head.Toxodon had broad jaws which were filled with bow shaped teeth and incisors.