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The hominid ilium is shaped by a synapomorphic growth mechanism that is unique within primates.

ABSTRACT: The human ilium is significantly shorter and broader than those of all other primates. In addition, it exhibits an anterior inferior iliac spine (AIIS) that emerges via a secondary center of ossification, which is unique to hominids (i.e., all taxa related to the human clade following their phyletic separation from the African apes). Here, we track the ontogeny of human and other primate ossa coxae. The human pattern is unique, from anlage to adulthood, and fusion of its AIIS is the capstone event in a repositioning of the anterior gluteals that maximizes control of pelvic drop during upright walking. It is therefore a hominid synapomorphy that can be used to assess the presence and age of bipedal locomotion in extinct taxa.

SUBMITTER: Zirkle D

PROVIDER: S-EPMC6628783 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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The hominid ilium is shaped by a synapomorphic growth mechanism that is unique within primates.

Zirkle Dexter D Lovejoy C Owen CO

Proceedings of the National Academy of Sciences of the United States of America 20190624 28

The human ilium is significantly shorter and broader than those of all other primates. In addition, it exhibits an anterior inferior iliac spine (AIIS) that emerges via a secondary center of ossification, which is unique to hominids (i.e., all taxa related to the human clade following their phyletic separation from the African apes). Here, we track the ontogeny of human and other primate ossa coxae. The human pattern is unique, from anlage to adulthood, and fusion of its AIIS is the capstone eve ...[more]

PMID: 31235562

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