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Here, dental and midfacial variables were studied in a perinatal sample of four anthropoid primates, including three callitrichines (Leontopithecus, Saguinus, and Callithrix) and Saimiri boliviensis. In the latter species, the maxillary recess (the ontogenetic precursor to a ��true�� maxillary sinus) does not undergo secondary pneumatization. Using histological methods and micro-computed tomography, midfacial and dental dimensions and radiographic hydroxyapatite density of tooth cusps were measured. The distribution of osteoclasts and osteoblasts was also documented. Kruskal�CWallis's one-way analysis of variance tests indicates significant (P Osimertinib molecular weight width/width of the nasal cavity] and highest bizygomatic�Cinterorbital index. Distribution of osteoclasts indicates that the inferomedial surfaces of Alectinib cost the orbits are resorptive in perinatal Saimiri, whereas, in all callitrichines, these surfaces are depository. Taken together, these findings suggest that pneumatization in Saimiri is suppressed by an inward growth trajectory of the orbits, relatively large posterior dentition, and a correspondingly compressed nasal GPX4 region. Am J Phys Anthropol, 2011. ? 2010 Wiley-Liss, Inc. ""Variation in humeral morphology among hominoids has long been recognized in relation to both phylogeny and behavior. Here, we use 3D landmark data to analyze humeral shape among hominoids, including hylobatids (n?=?37), Pongo (n?=?33), Homo (n?=?74), Pan (n?=?55), and Gorilla (n?=?45) to examine the relative influence of phylogenetic history vs. locomotor adaptation on humeral shape. Principal components analysis (PCA) of Procrustes shape data derived from 19 humeral type II or type III landmarks (Bookstein, 1991) for these taxa reveals the following: PC1, which primarily reflects the humeral torsion (or lack thereof) and relative diaphyseal and epiphyseal breadths, separates the relatively narrow-shafted, small articular dimensions and low humeral torsion Hylobates, and to a lesser extent, Pongo, humeri from those of the African hominoids. PC2, which largely contrasts shafts that are posteriorly convex (high PC2 scores) with antero-posteriorly straight humeral shafts (low PC2 scores) separates Homo, who tend to have A-P straighter shafts, from the more A-P bowed humeral shafts of the apes. These shape patterns suggest that the bowed shafts of Pan, Pongo, and Gorilla (and to a lesser extent, hylobatids) are due to the fact that in each of these taxa, the humerus is a weight-bearing bone, whereas the shafts of Homo are freed from locomotion.