the anterior dentition of azibiids is unknown, they may have possessed a toothcomb, indicating an ancient stem lineage of lemuriform primates in Africa, possibly descended from an early Asian branch of adapiforms such as a primitive branch of cercamoniines predating Donrussellia (one of the oldest European adapiforms). Tabelia hammadae, which was also considered to be one of the oldest known simians along with Algeripithecus, was shown to be a synonym of Azibius when more complete fossils were discovered at Gour Lazib between 2003 and 2009. Likewise, the second upper molar (M2) of Dralestes hammadaensis have been reinterpreted as being the upper fourth premolar (P4) of Azibius and has been considered a synonym. However, in 2010, Godinot cautiously suggested that Dralestes may be a synonym of Algeripithecus based on a blade-like premolar. He also reasserted his view that Algeripithecus was a simian based on its upper molar morphology and hypothesized that this applied to all azibiids, favoring his earlier view that they may be early simians instead of stem lemuriforms. In 2011, Marivaux et al. published an interpretation of recently discovered talus bones found at Gour Lazib, which they claimed were more similar to those of living strepsirrhines and extinct adapiforms, not simians, thus reinforcing the strepsirrhine status favored by Tabuce et al. two years earlier. The tali morphology also differed radically from those of plesiadapiforms, confirming that azibiids are true primates. Remains of a second, unnamed species of Azibius, cf. Azibius sp., have been discovered in the HGL-50 layer at Gour Lazib. It is known for a few upper and lower teeth. These teeth are three times larger than those of A. trerki. A larger right talus has also been found, and is assumed to belong to this new species. Anatomy and physiology All known azibiids were small-bodied primates. A. trerki is estimated to have weighed between , nearly twice the weight of the only other named azibiid, Algeripithecus, and was comparable in size to a gray mouse lemur (Microcebus murinus). The unnamed species, cf. Azibius sp., is estimated to have weighed and been comparable in size to a sportive lemur (Lepilemur). Azibius also had a short rostrum and very large orbits. Distribution Azibius has only been found in the Glib Zegdou Formation of the Gour Lazib area in southwest Algeria. The Glib Zegdou Formation dates to the late early or early middle Eocene, particularly the late Ypresian or early