New specimens and confirmation of an early age for Australopithecus anamensis

  title={New specimens and confirmation of an early age for Australopithecus anamensis},
  author={Meave G. Leakey and Craig S. Feibel and Ian Mcdougall and Carol V. Ward and Alan W. Walker},
The discovery of Australopithecus anamensis fossils from strata lying between tephra dated at 4.17 and 4.12 million years ago, and from slightly higher strata not well constrained in age by overlying dated units, provoked the claim that more than one species might be represented: it was suggested that the stratigraphically higher fossils, which include the important tibia, humerus and a large, presumed male, mandible (KNM-KP 29287), might belong to a later, more derived hominid. We have… Expand
New fossils of Australopithecus anamensis from Kanapoi, West Turkana, Kenya (2003-2008).
Nine new Kanapoi hominin fossils support the observation that canine crown height, morphology, root size and dimorphism were not altered from a primitive ape-like condition as part of a single event in human evolution, and that there may have been an adaptive difference in canine function between A. anamensis and A.afarensis. Expand
Asa Issie, Aramis and the origin of Australopithecus
New fossils from the Middle Awash study area that extend the known Au. Expand
Hominins from the Upper Laetolil and Upper Ndolanya Beds, Laetoli
Renewed investigations at Laetoli in northern Tanzania have led to the recovery of a number of new fossil hominins. A lower canine and a mandibular fragment from the Upper Laetolil Beds (3.63–3.85Expand
New hominid fossils from Woranso-Mille (Central Afar, Ethiopia) and taxonomy of early Australopithecus.
The Woranso-Mille hominids cannot be unequivocally assigned to either taxon due to their dental morphological intermediacy, but could be an indication that the Kanapoi, Allia Bay, and Asa Issie Au. Expand
Morphology of Australopithecus anamensis from Kanapoi and Allia Bay, Kenya.
Based on the limited postcranial evidence available, A. anamensis appears to have been habitually bipedal, although it retained some primitive features of its upper limbs, and there appears to be no autapomorphies precluding A.Anamensis from ancestry of A. afarensis. Expand
"Lucy" redux: a review of research on Australopithecus afarensis.
The discovery and naming of A. afarensis coincided with important developments in theory and methodology in paleoanthropology; in addition, important fossil and genetic discoveries were changing expectations about hominin divergence dates from extant African apes. Expand
The environments of Australopithecus anamensis at Allia Bay, Kenya: A multiproxy analysis of early Pliocene Bovidae.
Dietary reconstructions based on stable isotopes, mesowear, and hypsodonty reveal that these bovids' diet encompassed the full C3 to C4 dietary spectrum and overlap in the two data sets, allowing reconstructions of the paleoenvironments of A. anamensis to be extended to Allia Bay, where this pivotal hominin species is associated with heterogeneous settings. Expand
Asa Issie, Aramis and the origin of
New fossils from the Middle Awash study area that extend the known Au. Expand
New fossils of Australopithecus anamensis from Kanapoi, West Turkana, Kenya (2012-2015).
18 new fossils attributable to Australopithecus anamensis are yielded, including the second maxillary fragment known from a Kanapoi hominin and the first from a relatively young adult, and two new complete sets of mandibular incisors are notably large. Expand
Was Australopithecus anamensis ancestral to A. afarensis? A case of anagenesis in the hominin fossil record.
A phylogenetic analysis of four temporally successive fossil samples assigned to these species using polarized character-state data from 20 morphological characters of the dentition and jaws supports the idea that the A. anamensis and A. afarensis samples represent parts of an anagenetically evolving lineage, or evolutionary species. Expand


The first skull and other new discoveries of Australopithecus afarensis at Hadar, Ethiopia
53 new specimens from the Hadar Formation in Ethiopia confirm the taxonomic unity of A. afarensis and constitute the largest body of evidence for about 0.9 million years of stasis in the earliest known hominid species. Expand
Australopithecus ramidus, a new species of early hominid from Aramis, Ethiopia
The antiquity and primitive morphology of A. ramidus suggests that it represents a long-sought potential root species for the Hominidae. Expand
New four-million-year-old hominid species from Kanapoi and Allia Bay, Kenya
The mosaic of primitive and derived features shows this species to be a possible ancestor to Australopithecus afarensis and suggests that Ardipithecus ramidus is a sister species to this and all later hominids. Expand
A systematic assessment of early African hominids.
The phylogenetic relationships of the newly discovered fossil hominids are assessed and a new taxon, Australopithecus afarensis, is created to accommodate these Pliocene hominid fossils. Expand
Dental remains from the Hadar formation, Ethiopia: 1974–1977 collections
Dental remains of Australopithecus afarensis recovered from the Pliocene Hadar Formation, Ethiopia (1974–1977) are described anatomically. Descriptions are accompanied by illustrations andExpand
Hominid tarsal, metatarsal, and phalangeal bones recovered from the Hadar Formation: 1974-1977 collections
Anatomical descriptions are presented for the foot bones recovered from the Hadar Formation during the 1974–1977 field seasons inclusive.