Did Australopithecus anamensis and Australopithecus afarensis coexist?

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Australopithecus anamensis and Australopithecus afarensis Co-existed for Approximately 100,000 Years

The discovery of a remarkably complete 3.8-million-year-old skull, designated MRD, belonging to Australopithecus anamensis, provides compelling evidence that this species co-existed with Australopithecus afarensis for an estimated 100,000 years. This finding significantly alters previous understandings of human evolution during the Pliocene epoch, suggesting a more complex evolutionary landscape than a simple linear progression.
MRD Skull Discovery in Ethiopia

The MRD skull was unearthed in the Woranso-Mille region of Ethiopia, an area notable for its rich paleoanthropological finds. This specific site is located approximately 55 kilometres from the discovery location of the famous Lucy fossil, which belongs to Australopithecus afarensis. The MRD specimen is considered one of the most complete hominid fossils discovered that is older than three million years, offering an unprecedented glimpse into the facial anatomy of early human ancestors.
Challenging Evolutionary Models

Prior to the MRD discovery, a prevailing scientific belief posited that Australopithecus anamensis gradually evolved into Australopithecus afarensis over time. However, the co-existence of these two species for a considerable period challenges this gradualistic model. The presence of both species simultaneously suggests a potential for competition for resources or distinct ecological niches within the same landscape.
Morphological Links Between Early Hominids

The MRD skull exhibits a mosaic of characteristics that bridge the gap between much older hominid ancestors, such as Sahelanthropus tchadensis (Toumai), and later species like Australopithecus afarensis (Lucy). This specimen helps to connect previously disparate groups of early human ancestors, providing a more continuous picture of hominid morphology and evolutionary development over millions of years. The skull's features, including projected cheekbones, a prominent jaw, a flat nose, and a narrow forehead, offer new insights into the physical traits of Australopithecus anamensis.

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Did Australopithecus anamensis and Australopithecus afarensis coexist?

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