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Intraspecific variation was compared across column regions, morphological features, and species. Transitional regions and later ossifying morphological features were predicted to exhibit increased variation. The lumbosacral region, biomechanically important morphological features, and species with high locomotor demand and\/or dedicated pronogrady were predicted to exhibit decreased variation.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>We used a modified Levene's test to compare intraspecific variation in dimensions of the neural canal, vertebral bodies, and spinous and transverse processes in lower thoracic to proximal sacral vertebrae. The sample included all hominoid genera and one cercopithecoid (<jats:italic>Chlorocebus<\/jats:italic>).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>We found little difference in variation across regions of the vertebral column. In hominoids, vertebral body dimensions were the least variable, neural canal dimensions the most variable, with spinous and transverse processes generally intermediate. Among species, there was a general though not always significant pattern for<jats:italic>Chlorocebus<\/jats:italic>to exhibit the least variation, followed by<jats:italic>Homo<\/jats:italic>or<jats:italic>Hylobates.<\/jats:italic><\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>Patterns of variation across morphological features may reflect the complex interaction of functional constraints, developmental timing, and\/or variable biomechanical forces.<jats:italic>Pongo<\/jats:italic>'s elevated variation in spinous process length suggests a release from functional constraint, consistent with its suspensory locomotion and reduced spinous processes. Interspecific differences in vertebral variation based on locomotor demand or posture are generally consistent with patterns previously reported for vertebral formula and other aspects of morphology. Future research would benefit from an expanded taxonomic sample and more detailed analyses of vertebral modularity and developmental timing.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ajpa.23730","type":"journal-article","created":{"date-parts":[[2018,11,8]],"date-time":"2018-11-08T19:52:57Z","timestamp":1541706777000},"page":"131-144","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Functional and developmental influences on intraspecific variation in catarrhine vertebrae"],"prefix":"10.1002","volume":"168","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3830-7596","authenticated-orcid":false,"given":"Liza J.","family":"Shapiro","sequence":"first","affiliation":[{"name":"Department of Anthropology University of Texas at Austin Austin Texas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Addison D.","family":"Kemp","sequence":"additional","affiliation":[{"name":"Department of Anthropology University of Texas at Austin Austin Texas"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2018,11,8]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-45532-2_15"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1558-5646.1985.tb04076.x"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1095-8312.1982.tb02038.x"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1017\/CBO9781139174596"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1420-9101.2011.02240.x"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/ajpa.22604"},{"key":"e_1_2_8_8_1","first-page":"201","volume-title":"The Baboon in Medical Research","author":"Benton R. 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