Algeripithecus minutus. (a) Composite of isolated P2 (HGL50/297, reversed), P3 (HGL50/298, reversed), P4 (HGL50/299, reversed), M1 (GZC7), M2 (GZC1) and M3 (HGL50-321) in occlusal views. (b) M2 (GZC1). (c) P4 (HGL50/299) in mesial and distal views, respectively. (d–f) Mandible with P3–M3 and alveoli for C–P2 (denoted by red and yellow arrows, respectively) (HGL50/397) (d) in occlusal, (e) mesial and (f) labial views. (g) P3–4 (HGL50/397) in lingual view. Scale bar, 1 mm.
Azibius trerki. (a,b) Maxilla with P3–4 (HGL51/46) in labial (a) and disto-lingual (b) views. (c) Composite of maxilla with M1–2 (HGL50/396, reversed), P3–4 and M3 with alveoli for C–P2 (denoted by red and yellow circles, respectively) (HGL51/46) in occlusal view. (d) P3 (HGL51/46) and (e) P4 (GZC41) in distal view. (f) M1 (HGL50/248, reversed) in occlusal view. (g,h) Mandible with P3–M3 (HGL50/256) in occlusal (g) and labial (h) views. Abbreviations: hard palate, hp; infra-orbital canals, ioc; infra-orbital foramens, iof; jugo-maxillary suture, jms; lacrimal canal, lc; orbital floor, of. Scale bar, 1 mm.
Variability in the configuration of the lacrimal and infraorbital canal in extant and extinct primates (virtual three-dimensional surfaces derived from µCT image data; see text 3 and table S3 in the electronic supplementary material). (a) Adapis sp., (b) Microcebus murinus, (c) Microchoerus erinaceus, (d) Tarsius syrichta, (e) Cebus apella and (f) Aotus trivirgatus. Note how these canals tend to be perpendicular in anthropoids and Tarsius, but form a narrower angle in Azibius trerki (figure 2), crown and stem strepsirrhines and Microchoerus, an extinct omomyiform primate. Scale bar, 5 mm.
Phylogenetic position of the azibiids Algeripithecus and Azibius (in bold) within the Strepsirhini clade (denoted by the asterisk). This topology results from an analysis, including 83 primate taxa and 341 dental, cranial and postcranial characters, having generated 369 equally most parsimonious trees of 2851 steps each (consistency index, CI = 0.1887; retention index, RI = 0.5335) (see text 2 and figure S2 in the electronic supplementary material). Abbreviations: Azibiidae, A.; Adapidae, Ad.; Djebelemurinae, D.; Sivaladapidae, S.